Worcester Greenstar 4000 Installation And Maintenance Instructions Manual

Greenstar 4000 – 6 720 891 161 (2020/09) 74 360 V System fault boiler electronics / basic controller ▶Wrong code plug is inserted. ▶Check the code plug is not damaged. ▶Replace the code plug if required. 362 – Boiler identification module or boiler electronics faulty Is not a fault. • Service plug detected. 363 V System fault boiler electronics / basic controller ▶Check and replace the ionisation cable. ▶Check and replace the electrodes if required. ▶Check and replace the control unit and/or burner control unit. 1010 – No communication via EMS ...

Variant with screws Checking 3-way valve motor. ▶Carry out function check of 3-way valve motor in Function check menu. – Service menu > Function check > Activate test 1) > 3-way valve > Hot water. Detaching the motor. ▶Set the 3-way valve to mid position. – Service menu > Settings > Special function > 3-WV mid. pos.> Yes. The 3-way valve remains at the middle position for approx. 15 minutes. ▶Detach the motor in the sequence shown. – Unplug the plug. – Remove the screws. – Pull on the motor gently and lift it up. � ...

3 Greenstar 4000 – 6 720 891 161 (2020/09) 9.7 Replacing the gas valve . . . . . . . . . . . . . . . . . . . . . . . . .68 9.8 Combi boilers: checking the plate heat exchanger . . . .68 9.9 Replacing the expansion vessel. . . . . . . . . . . . . . . . . . .68 9.10 Replacing the PRV . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68 9.11 Replacing the pressure sensor. . . . . . . . . . . . . . . . . . . .69 9.12 Pressure gauge removal. . . . . . . . . . . . . . . . . . . . . . . . .69 9.13 Replacing the control unit . . . . . . . . . . . . . . . . . . . . ...

Greenstar 4000 – 6 720 891 161 (2020/09) 80 System gassing WARNING If you suspect the heating system is gassing, you must exercise caution when carrying out testing or remedial work as the gasses produced can be flammable. Do not vent air from radiators whilst the central heating is switched on. Allow 30mins after venting the radiators before using the central heating or hot water. ▶Whilst venting radiators, do not allow the pressure on the boiler to drop below the point at which it is normally set. ▶If the system is to be drained, the boiler must be electrica ...