ACV HeatMaster 25 Operation & User’s Manual

660Y1400-A General recommendations ...............................3 User's GUide .............................................................. 4 How to use this manual ....................................................................................4 appliance description .........................................5 MCBA Interface ........................................................................................................5 connection diaGrams and accessories ....... 6 High-temperature heating circuit controlled by a room thermostat ..................................................................................................................6 Installation of two heating circuits controlled by room unit and ZMC-2 module ............................................................................................10 Cascade installation.......................................................................................... 13 mcBa parameters for the specialist ............ 14 Stand-by Mode ( ) .............................................................................. 14 Parameter Mode ( ) ........................................................................... 16 info Mode ( ) ........................................................................................... 17 Code Mode ( ) .......................................................................................20 Setting the parameters ................................................................................ 21 Communication Mode (with code) : ...................................................29 Fan Mode (with code) : ...................................................................................29 Error Mode (with code) : ................................................................................29 BlockaGe and error codes ..............................30 List of error codes + solutions [in error mode] ...........................30

this manual must be provided to the installer, who will keep it in a safe place. We accept no liability should any damage result from the failure to comply with the instructions contained in this technical manual. Essential recommendations for safety • It is prohibited to carry out any modifications to the appliance without the manufacturer’s prior and written agreement. • The appliance must be set up by a qualified installer, in accordance with applicable standards and regulations. • The installation must comply with the instructions contained in the boiler's installation manual and with the standards and regulations applicable to installations. • Failure to comply with the instructions in this manual could result in personal injury or a risk of environmental pollution. • The manufacturer declines all liability for any damage caused as a result of incorrect installation or in the event of the use of appliances or accessories that are not specified by the manufacturer. Essential recommendations for the correct operation of the appliance • To guarantee the correct operation of the installation, it is essential to carry out the adjustments in accordance with the instructions in this manual. • In order to ensure that the appliance operates correctly, it is essential to inspect and service the boiler every year. • Faulty parts may only be replaced by genuine factory parts. If you smell gas: - Immediately isolate the gas supply. - Open windows and doors to ventilate the area. - Do not use any electrical appliances and do not operate any switches. - Immediately notify your gas supplier and/or your installer.. en 3 EN 660Y1400-A GEnErAL rECoMMEndAtIonS

This manual is for the exclusive use of ACV-approved installers. After a short description of the control module (MCBA) and of the keys used to make the adjustments, the manual includes a section with the installation diagrams and a list of the accessories required for each specific installation. The electrical connection diagrams are also included as well as the specific settings of the MCBA to be made using an access code provided by ACV. The next sections contain the codes available in each mode of the MCBA, as well as the error codes displayed on the MCBA, which will allow the installer to troubleshoot the possible faults. For any other installation configuration than those in this manual, please contact your ACV representative.

required temperature of the Domestic Hot Water (DHW) and the Central Heating (CH) and to activate/deactivate the DHW and heating modes using the display and the following keys: 1. display: Indicates the modes and appliance settings through the use of various codes. 2. "Reset" key: Allows to reset the appliance. 3. Connector: Allows to connect a laptop equipped with the appropriate software to the MCBA. 4. "Mode" key: Allows to toggle the modes and define various parameters. 5. "Step" key: Allows to scroll through the various functions of a mode. 6. "Store" key: Allows to save the defined settings. 7. "+" key: Allows to increase the displayed value. 8. "-" key: Allows to decrease the displayed value. mcBa interface The MCBA is an electronic control module and a regulator for gas boilers, developed by Honeywell and fitted with a microprocessor. It includes several basic functions: temperature control, flame monitoring, heating pump control, fan control, 3-way valve control, electrical ignition and boiler control. Its control panel also displays, through codes, the boiler operational condition, the mode in which it is operating and the possible faults in the system. Finally, it allows to set the system up according to the type of installation. Using a special maintenance code to be entered in the MCBA interface, the qualified installers can access parameters and therefore adjust the boiler settings to specific requirements. The parameters are normally factory-preset for all normal applications. For more information on how to use the MCBA and on the specific settings, refer to the section "MCBA Parameters for the Specialist", page 14 of this manual. General remarks If a fault occurs, the MCBA disables the appliance and displays an error code: the display flashes and the first character is "E" followed by the fault number. - Reset the appliance by pressing the "RESET" key of the MCBA interface. - If the error code displays again, refer to the section "Blockage and Error Codes", page 30 of this manual

hiGh-temperatUre heatinG circUit controlled By a room thermostat

660Y1400-A Required optional material Applicable to Description Code All HM TC models room thermostat ACV 22 10800018 HM 25 / 35 / 45 TC High temperature kit dn 25 : comprised of a heating pump, two isolating valves, a check valve, two thermometers. 10800294 HM 70 / 85/ 120 TC High temperature kit dn 32 : comprised of a heating pump, two isolating valves, a check valve, two thermometers. 10800296 1 2 2

connect the room thermostat. 1 2 3 4 5 6 7 8 9 10 11 12 13 1 2 3 4 5 6 EN en 8 ConneCtion Diagrams anD aCCessories 660Y1400-A Block diagram for wiring in accordance with applicable standards.

660Y1400-A Setting the MCBA Initial Adjusted DESCRIpTIon 3. 0 1 3. 0 1 00 : Heating mode “oFF” 01 : Heating mode “on” 4. 85 4. 85 Preset temperature for the heating circuit water (adjustable between 30 and 85°C). p. 45 . 00 p. 45 . 00 00 : Using an outdoor sensor and a room thermostat

660Y1400-A installation of two heatinG circUits controlled By room Unit and Zmc-2 modUle MCBA M M 3 3 1 5 7 7 4 2 2 6

660Y1400-A Required optional material Applicable to Description Code All HM TC models room Unit rSC delivered with outdoor sensor 10800034 All HM TC models ZMC-2 Module (kit) Manages the second heating circuit - alarm contact - only functions in conjunction with the room Unit rSC. 10800218 X2 All HM TC models Clip-in interface rMCIEBV3 Enables communication between the MCBA and the room Unit rSC. 10800036 All HM TC models 2kΩ — VF202 contact sensor For outlet on controlled circuit 10800045 X2 All HM TC models rAM 5109 contact thermostat Mandatory to protect all the floor heating circuits. 10510900 All HM TC models 12kΩ — AF120 outdoor sensor 10510100 HM 25 / 35 / 45 TC 2 circuit manifold dn 25 With connection pipes and built-in wall mounts 10800208 HM 25 / 35 / 45 TC Low temperature kit dn 25 Is comprised of a heating pump, two isolating valves, a check valve, two thermometers and a 3-way valve with built-in bypass. 10800295 HM 70 / 85/ 120 TC 2 circuit manifold dn 32 With built-in wall mounts. 10800298 HM 70 / 85/ 120 TC Manifold connection kit dn 32 Includes two stainless steel hoses Ø 1"1/2 with Ø 1"1/4 reducer 10800142 HM 70 / 85/ 120 TC Low temperature kit dn 32 Is comprised of a heating pump, two isolating valves, a check valve, two thermometers and a 3-way valve with built-in bypass. 10800297 X2 HM 70 / 85/ 120 TC Servomotor ArA661 Motor for 3-way valve DN 32 with the low-temperature kit. 10800199 X2 3 2 1 4 5 6 7 6 7 6 7

VF202 1 2 3 4 5 6 7 8 9 10 11 12 13 2 1 BUS A BUS B BUS A BUS B BUS B BUS A BUS B BUS A ZMC-2 (230 Volt) A B VF 0 VE 0 VF202 L 1 L 2 3 N N PE VA N N N M 230 Volt - 6A 50Hz L 1 L 2 3 N N PE VA N N N M 230 Volt - 6A 50Hz Block diagram for wiring in accordance with applicable standards. 10800036: Interface address “0” = 7 = 6 = 5 = 4 = 3 = 2 = 1 = 0 EN en 12 ConneCtion Diagrams anD aCCessories 660Y1400-A

660Y1400-A Setting the MCBA Initial Adjusted DESCRIpTIon 1. 60 1. 60 Maximum temperature of preset Domestic Hot Water temperature 2. 0 1 2. 0 1 00 : DHW mode “oFF” 01 : DHW mode “on” 3. 0 1 3. 0 1 00 : Heating mode “oFF” 01 : Heating mode “on” 4. 85 4. 85 Maximum temperature of the heating circuit (must be higher than the DHW temperature). cascade installation For information on the installation of several HeatMaster® TC boilers in a cascade, please contact your ACV representative.

stand-By mode ( ) When the boiler is switched on, it starts up in Stand-by mode, as shown in the figure above. this is the standard mode of the MCBA. the MCBA automatically returns to this mode after 20 minutes if no key is pressed on the MCBA interface. the new parameters will become active. the first digit indicates the boiler’s current status, depending on the situation of the boiler and the burner. the last two digits indicate the boiler temperature. Status Boiler Function 0 Standby, no heat demand 1 Fan pre-purge/post-purge 2 Ignition 3 Operation of the burner for heating 4 Operation of the burner for domestic hot water production 5 Waiting for a signal from the air pressure switch or to obtain number of start revolutions. 6 The burner is off because the set value has been reached. There is still a demand for heat.. 7 Heating pump time delay after demand for heating. 8 Heating pump time delay after demand for DHW. 9 Blocked burner: refer to "Blockage and Error Codes", page 30

660Y1400-A If the burner is blocked for one of the above reasons, the display toggles between "9" and the temperature (last two digits) and “b” with the error code Once the cause of the blocking has been resolved, the burner starts up automatically after a maximum of 150 seconds.. Status Boiler Function Internal adjustment — Three-way valve Boiler burner on - temperature is maintained Test function: max RPM in CH mode. Test function: min RPM in CH mode. Test function: burner on with fixed fan speed

660Y1400-A parameter mode ( ) SETTIng THE MCBA pARAMETERS to access the Parameter mode when the system is in Standby mode, press the “MoDE” key once. to scroll through the list of parameters press the “STEp” key. to modify the value of the parameter, use the “+” or “-” keys. then, press the “SToRE” key to save the modified value. the screen will flash once to confirm the data has been saved. to activate the modified parameters, press “MoDE” again (this will switch you to Info mode). However, if you do not press any key, the system returns to Standby mode after 20 minutes and activates the changes. Factory settings STEp Display parameter Description HM 25 / 35 / 45 / 70 / 85 /120 TC HM 71 / 101 / 201 1. 67 Setting the hot water temperature 1. 60 1. 90 2. 0 1 Hot water production (DHW) 00 = OFF 01 = ON 2. 0 1 2. 0 1 3. 0 1 Switching heating On/Off 00 = OFF 01 = ON 3. 0 1 3. 0 1 4. 70 Maximum temperature in central heating mode (CH) 4. 85 4. 90 DISplAy ModE

660Y1400-A info mode ( ) InFoRMATIon on THE InSTAllATIon to switch from Stand-by mode to Info mode, press the “MoDE” key twice Press the “STEp” key until the desired information is displayed. the dot located behind the first position flashes to indicate that the boiler is in Info mode. DISplAy MoDE MoDE STEp Display parameter Description 1. 60 Flow temperature T1 in °C 2. 50 Return temperature T2 in °C 3. 65 DHW temperature T3 in °C 4. 03 Outside temperature T4 in °C 5. 55 Flue gas temperature T5 in °C 6. 45 Flow temperature set-point calculated in °C 7. 00 Rate of increase of flow temperature in °C/S

660Y1400-A STEp Display parameter Description 8. 00 Rate of increase of return temperature in °C/S 9. 00 Rate of increase of DHW temperature in °C/S a. 34 Flow temperature of 2nd central heating circuit n/A c. 00 n/A n/A E. 00 Ionisation current F. 00 n/A n/A h. 42 Internal MCBA temperature i. 00 Number of CH starts [ x 10000]

660Y1400-A STEp Display parameter Description Number of CH starts [ x 100] Number ofCH starts [ x 1] Number of hours of CH operation [ x 10000] Number of hours of CH operation [ x 100] Number of hours of CH operation [ x 1] Number of DHW starts [ x 10000] Number of DHW starts [ x 100] Number of DHW starts [ x 1] Number of hours of DHW operation [ x 10000] Number of hours of DHW operation [ x 100] Number of hours of DHW operation [ x 1]

660Y1400-A code mode ( ) EnTERIng THE CoDE By entering the code you can access from parameter 10 to parameter 113 and consult the communication mode, the fan speed mode and the Error mode. Only ACV approved installers know the access code. For more information, please contact our after-sales service. to access the Code mode, press simultaneously on MoDE and STEp. (only inStand-by mode!] Press once on theSTEp key and the screen displays “C” in the first position then random characters in the third and fourth positions. Press on "+" or "-" key to change the code Press the SToRE key, the screen flashes briefly to indicate that the code has been accepted. Press the MoDE key until the desired mode appears. MODE STEP STEP + - or STORE

660Y1400-A settinG the parameters Only accessible using the code Factory settings STEp Display parameter Description HM 25 / 35 / 45 / 70 / 85 / 120 TC HM 71 / 101 / 201 p. 1 0 Minimum central heating temperature using outdoor sensor.. . 60 . 60 p. 1 1 Minimum outdoor temperature [adjustment of the heating curve]. .-10 . 00 p. 12 Maximum outdoor temperature [adjustment of the heating curve]. . 18 . 20 p. 13 Frost protection temperature. . 0 1 . 05 p. 14 Correction for outside temperature. . 00 . 00 p. 15 Maximum flow temperature of the 2nd circuit. . 50 . 60 p. 16 Minimum flow temperature of the 2nd circuit. . 20 . 30 p. 17 Hystérésis of the 2nd circuit temperature. . 03 . 0 1 p. 18 T lock: 00 = DISABleD locks the heat demand, if the heating set-point T° is lower than the parameter value.. . 00 . 00

660Y1400-A settinG the parameter: only accessible using the code Factory settings STEp Display parameter Description HM 25 TC HM 35 TC HM 45 TC p. 19 Booster 00 = OFF [minute]. . 00 . 00 . 00 p. 20 Night time central heating reduction (°C). . 1 0 . 1 0 . 1 0 p. 21 Increase of the primary temperature set point to generate hot water.. . 20 . 20 . 20 p. 22 Max. fan speed in heating mode [rpm. x 100]. Natural gas . 44 . 63 . 68 Propane . 4 1 . 65 . 69 p. 23 Max. fan speed in central heating mode [rpm.]. Natural gas . 00 . 00 . 00 Propane . 00 . 00 . 00 p. 24 Max fan speed in domestic hot water mode [rpm x 100]. Natural gas . 44 . 63 . 68 Propane . 4 1 . 63 . 69 p. 25 Min. fan speed in DHW mode [rpm]. Natural gas . 00 . 00 . 00 Propane . 00 . 00 . 00 p. 26 Min fan speed in domestic hot water mode [rpm x 100]. Natural gas . 20 . 20 . 20 Propane . 24 . 24 . 24 p. 27 Min fan speed [rpm x 100]. Natural gas . 00 . 00 . 00 Propane . 00 . 00 . 00

660Y1400-A Factory settings HM 70 TC HM 85 TC HM 120 TC HM 71 HM 101 HM 201 . 00 . 00 . 00 . 00 . 00 . 00 . 1 0 . 1 0 . 1 0 . 1 0 . 1 0 . 1 0 . 1 0 . 1 0 . 1 0 . 05 . 05 . 05 . 49 . 60 . 53 . 46 . 60 . 52 . 45 . 55 . 53 . 42 . 54 . 47 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 49 . 65 . 53 . 46 . 60 . 59 . 45 . 60 . 53 . 42 . 54 . 53 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 1 9 . 1 9 . 1 3 . 1 4 . 1 5 . 1 5 . 1 9 . 1 9 . 1 3 . 1 4 . 1 5 . 1 5 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00

660Y1400-A settinG the parameter: only accessible using the code Factory settings STEp Display parameter Description HM 25 TC HM 35 TC HM 45 TC p. 28 Fan speed during ignition [rpm x 100]. Natural gas . 36 . 36 . 36 Propane . 36 . 36 . 36 p. 29 Fan speed during slow start [rpm. x 100] . 30 . 30 . 30 p. 30 Min. power time after start-up in CH mode [sec. x 9,0] . 00 . 00 . 00 p. 32 Central heating pump over run 00 = 10 sec. [min.] . 00 . 00 . 00 p. 33 Domestic hot water pump over run [sec. x 10,2]. . 1 1 . 1 1 . 1 1 p. 34 CH hysteresis on. . 02 . 02 . 02 p. 35 CH hysteresis off. . 03 . 03 . 03 p. 36 DHW hysteresis on. . 00 . 00 . 00 p. 37 Burner trigger hysteresis (DHW). . 06 . 06 . 06 p. 38 DHW detection hysteresis on. . 05 . 05 . 05 p. 39 DHW detection hysteresis off. . 00 . 00 . 00 p. 40 Central heating block time [sec. x 10,2]. . 05 . 05 . 05

660Y1400-A Factory settings HM 70 TC HM 85 TC HM 120 TC HM 71 HM 101 HM 201 . 39 . 39 . 44 . 35 . 42 . 37 . 39 . 39 . 44 . 32 . 38 . 32 . 30 . 30 . 30 . 30 . 30 . 30 . 00 . 00 . 18 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 1 1 . 1 1 . 1 1 . 1 1 . 1 1 . 1 1 . 02 . 02 . 02 . 01 . 01 . 01 . 03 . 03 . 03 . 03 . 03 . 03 . 00 . 00 . 00 . 0 1 . 0 1 . 0 1 . 06 . 06 . 06 . 03 . 03 . 03 . 05 . 05 . 05 . 04 . 04 . 04 . 00 . 00 . 00 . 0 1 . 0 1 . 0 1 . 05 . 05 . 05 . 00 . 00 . 00

660Y1400-A Factory settings STEp Display parameter Description HM 25 TC HM 35 TC HM 45 TC p. 41 Domestic hot water block time [sec. x 10,2]. . 00 . 00 . 00 p. 42 DHW CH locking time [sec. x 10,2]. . 00 . 00 . 00 p. 43 Max. operating time in DHW mode [min.] . 00 . 00 . 00 p. 45 00 : High temperature circuit - heating pump controlled by room thermos- tat - DHW priority active. 50 : Controlled circuit [outdoor sensor and AM3-11 module] - circulator controlled by the room thermostat - DHW priority inactive. . 00 . 00 . 00 p. 46 DHW pRoDuCTIon TypE: This parameter may be modified in any way on a HeatMaster® . 02 . 02 . 02 p. 47 Manual fan speed (test) .-0 1 .-0 1 .-0 1 p. 53 1st: special pump [0 = disabled] 2nd position: minimum disable cycle [0 = disabled] . 00 . 00 . 00 p. 57 Pre-spark [sec.] . 00 . 00 . 00 p. 64 extra pre-sweep [sec.] . 25 . 25 . 25 p. 65 Post ventilation [sec.] . 30 . 30 . 30 p. 66 Fan speed during post-ventilation [tr=min. x 100] . 25 . 25 . 25 p. 76 Opening time of the 2 nd CH circuit valve[sec. x 15] . 1 0 . 1 0 . 1 0 p. 77 Factor "I" of the 2 nd CH circuit . 1 0 . 1 0 . 1 0 p. 78 Fan factor "I" (raise) . 20 . 20 . 20 p. 79 Fan factor "I" (lower) . 1 0 . 1 0 . 1 0 p. 83 Max. T5 temperature limit . [C°]. . 120 . 120 . 120

660Y1400-A Factory settings HM 70 TC HM 85 TC HM 120 TC HM 71 HM 101 HM 201 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 02 . 02 . 02 . 1 2 . 1 2 . 1 2 .-0 1 .-0 1 .-0 1 .-0 1 .-0 1 .-0 1 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 00 . 25 . 25 . 25 . 25 . 25 . 25 . 30 . 30 . 30 . 30 . 30 . 30 . 25 . 25 . 25 . 30 . 30 . 30 . 1 0 . 1 0 . 1 0 . 1 6 . 1 6 . 1 6 . 1 0 . 1 0 . 1 0 . 1 0 . 1 0 . 1 0 . 40 . 40 . 1 0 . 60 . 60 . 1 0 . 20 . 20 . 05 . 1 0 . 1 0 . 50 .1 20 .1 20 .1 20 .1 20 .1 20 .1 20

660Y1400-A Factory settings STEp Display parameter Description HM 25 TC HM 35 TC HM 45 TC HM 70 TC HM 85 TC HM 120 TC HM 71 HM 101 HM 201 p. 84 Max. T6 temperature limit . [C°] . 80 . 80 . 80 . 80 . 80 . 80 . 80 . 80 . 80 p. 87 Maximum dT1/ dt [x 0.1 °C/sec.] . 30 . 30 . 30 . 30 . 30 . 30 . 30 . 30 . 30 p. 89 Maximum dT3/ dt [x 0.1 °C/sec.] . 20 . 20 . 20 . 20 . 20 . 20 . 20 . 20 . 20 p. 90 Difference T1 - T2 for modulation . 10 . 10 . 10 . 10 . 10 . 10 . 1 5 . 1 5 . 1 5 p. 96 Pulses per rotation/PWM frequen- cy . 92 . 92 . 92 . 92 . 92 . 92 . 92 . 92 . 93 p. 97 external ignition/start attempts . 05 . 05 . 05 . 05 . 05 . 05 . 05 . 05 . 05 p. 100 Maximum NTC1-NTC2 time [sec. x 15] . 40 . 40 . 40 . 40 . 40 . 40 . 40 . 40 . 40 p. 101 Minimum to maximum time in CH mode [sec.] . 60 . 60 . 60 . 60 . 60 . 60 . 60 . 60 . 60 p. 105 System 1 options .-120 .-120 .-120 .-120 .-120 . 08 . -128 . -128 . -128 p. 106 System 2 options . 108 . 108 . 108 . 108 . 108 . 108 . 116 . 116 . 116 p. 109 Protection options 2 . 32 . 32 . 32 . 32 . 32 . 32 . 32 . 32 . 32 p. 113 Additional parameter 0 [Value + 256] . 119 . 119 . 119 . 119 . 119 . 247 . 127 . 127 . 127

660Y1400-A commUnication mode (with code) : This mode indicates communication between the boiler and the control module. MoDE Display STEp Display parameter Description No communication Communication only between the boiler module and the optional control module. Communication between all the connected appliances. The interface kit and the programmable room thermostat are available as an option. fan mode (with code) : This mode indicates the current fan speed. MoDE Display STEp Display parameter Description FaN 5500 The current speed of the fan is 5,500 rpm. error mode (with code) : This mode indicates the most recent error, as well as the status of the boiler and the values at the time of this error. MoDE Display STEp Display parameter Description 1 36 error code at last lockout 2 00 Boiler status at the time of the error 3 00 T1 temperature at the time of the error 4 00 T2 temperature at the time of the error 5 00 Hot water temperature T3 at the time of the error 6 00 Outdoor temperature T4 at the time of the error

list of error codes + solUtions [in error mode] If a fault occurs during operation, the system locks out and the display starts to flash. The first character is an “E” or “b” and the following two indicate the code of this fault, as indicated in the table below. To unlock the system: • press "RESET" on the MCBA interface. • If the fault repeats, check the error codes below to solve the problem. Codes Fault description Fault solutions E 00 Abnormal flame signal detected 1. Check the wiring (short circuit in the 24 V wiring) 2. Check the electrode 3. Replace the MCBA (water damage) E 02 No flame presence after five start-up attempts 1. Check the ignition wiring 2. Check the electrode and its position 3. Check the burner gas level E 03 Gas valve or triac error Replace the rectifier or the gas valve E 04 Durable locking Press “ReSeT” E 05 No flame detection or poor feed current quality 1. Check the electrode gap 2. Check resistance kΩ of the electrode cable 3. Stabilisation of the current E 06 Detection of an Input error Check the Input and press “ReSeT” E 07 Gas valve relay error If the problem persists after two “ReSeT” attempts, replace the MCBA E 08 The air pressure switch did not close Check the air pressure switch E 1 1 ePROM error If the problem persists after two “ReSeT” attempts, replace the MCBA E 12 Max input thermostat open or 24 V fuse has blown 1. Check the limit thermostat 2. Check the 24 Volt fuse of the MCBA 3. link 12-13 missing E 13 Internal error If the problem persists after two “ReSeT” ATTeMPTS, replace the MCBA E 14 Water in the 24 Volt circuit Check the 24 Volt circuit and dry if necessary [sensors, terminal, etc.]

660Y1400-A Codes Fault description Fault solutions E 15 Internal error If the problem persists after two “ReSeT” attempts, replace the MCBA E 16 Internal error If the problem persists after two “ReSeT” attempts, replace the MCBA E 17 Internal error If the problem persists after two “ReSeT” attempts, replace the MCBA E 18 T1 > 110°C 1. Check the NTC wiring and replace if necessary 2. If the NTC1 sensor is OK, check if there is water flow in the boiler E 19 T2 > 110°C Check the NTC wiring and replace if necessary The NTC1 and NTC2 sensors are the wrong way round Switch NTC1 with NTC2 E 25 T1 Gradient too high 1. Check if the pump is running 2. If there is no problem with the pump, bleed the system Gas pressure switch or low-water pressure switch open Check the gas pressure or the water pressure and the respective switches excessive temperature of the pump control module 1. Pump control overheated 2. Check the functionality of the pump (flow) 3. Check the pump for dirt Boiler pump switch not activated, pump nonfunctional / blocked Check the functionality of the pump, pump does not run. E 28 No tachometer signal from the fan 1. Check the PWM connection 2. Check the fan wiring 3. If the problem persists after two “ReSeT” attempts, replace the fan. Otherwise change the MCBA E 29 The fan’s tachometer signal does not drop back to “0” 1. Check the draught in the flue pipe 2. If the draught is sufficient, replace the fan E 30 Maximum temperature difference between T1 and T2 is too high Check the water flow rate

660Y1400-A Codes Fault description Fault solutions E 3 1 Short-circuit NTC1 1. Check the connection of the NTC1 sensor 2. Check the wiring of the NTC1 sensor 3. If the problem persists replace the NTC1 sensor E 32 Short-circuit NTC2 1. Check the connection of the NTC2 sensor 2. Check the wiring of the NTC2 sensor 3. If the problem persists replace the NTC2 sensor E 33 Short-circuit NTC3 1. Check the connection of the NTC3 sensor 2. Check the wiring of the NTC3 sensor 3. If the problem persists replace the NTC3 sensor E 35 Short-circuit NTC5 1. Check the connection of the NTC5 sensor 2. Check the wiring of the NTC5 sensor 3. If the problem persists replace the NTC5 sensor E 36 NTC1 open circuit 1. Check the connection of the NTC1 sensor 2. Check the wiring of the NTC1 sensor 3. If the problem persists replace the NTC1 sensor E 37 NTC2 open circuit 1. Check the connection of the NTC2 sensor 2. Check the wiring of the NTC2 sensor 3. If the problem persists replace the NTC2 sensor E 38 NTC3 open circuit 1. Check the connection of the NTC3 sensor 2. Check the wiring of the NTC3 sensor 3. If the problem persists replace the NTC3 sensor E 40 NTC5 open circuit 1. Check the connection of the NTC5 sensor 2. Check the wiring of the NTC5 sensor 3. If the problem persists replace the NTC5 sensor Value of ePROM parameters out of tolerance If the problem persists after two “ReSeT” attempts, reprogramme the MCBA E 44 Internal error If the problem persists after two “ReSeT” attempts, replace the MCBA E 52 Flue gas temperature too high (NTC5) 1. Check the connection of the NTC5 sensor 2. Check the wiring of the NTC5 sensor 3. If the problem persists replace the NTC5 sensor E 60 error during reading of the parameters 1. Press "ReSeT" 2. If the error persists, replace the MCBA

660Y1400-A Codes Fault description Fault solutions E 6 1 Air pressure switch closed when it should have opened Check the air pressure switch Water pressure Check the water pressure Incorrect fan speed during start-up 1. Check the supply voltage of the MCBA 2. If you detect no problems with it, replace the fan E 83 Temperature of the NTC6 sensor too high Check the 3-way valve or the valve motor E 1 1 3 Network frequency out of tolerance Check the mains frequency E 1 1 4 Conflicting or invalid cascade address Check the cascade address E 1 1 5 Internal error If the problem persists after two “ReSeT” attempts, replace the MCBA Deviation of the mains frequency > 1.5 Hz Check the mains frequency Opening of air pressure switch during burner operation Check the air pressure switch Ionisation current too low during burner operation Measure the ionisation current Gas pressure switch opened during burner operation Check the gas pressure switch E122 NTC1 or NTC2 sensor deviation Check the NTC1 and NTC2 sensors E123 NTC1 or NTC2 sensor faulty Check the NTC1 and NTC2 sensors E124 NTC1 or NTC2 sensor stuck Check the NTC1 and NTC2 sensors