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Plumbing and Gas News

Practical tips for maintenance, service and repairs of plumbing and gas appliances

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Maintenance and Service

Boilers

Vaillant ecotec Plus 824 - Fault F.75 - Faulty expansion vessel (181051)

Vaillant ecotec Plus 824 looses pressure after using heaiting.

  • When you turn the heating on after the short period of time the pressure level goes up to red zone (3Bars)
  • High pressure forces a Pressure Relief Valve to open to release the excessive pressure from the system as the water expands when heated up (up to 4% at 100ºC)
  • An expansion vessel contains a rubber membrane which separates a pressurised air and central heating water.
  • Annual boiler service is required to check and re-pressurise the expansion vessel up to 1 bar (with a bicycle pump). Drain the boiler water before recharging.
  • If water starts leaking from the expansion's vessel nipple then it is faulty and needs replacement. Very often it needs replacement together with a Pressure Relief Valve
  • The part numbers are: Vaillant Ecotec Expansion Vessel 181051 & PRV 178985

2017-03-05

Boilers

Keston Qudos 28S - Faulty fan (Q10S301001) Error code E28

Keston Qudos 28s - no heating or hot water. Error code E28

  • The boiler pump is working but after 5 seconds the boiler goes into a lock out with an error code E28 which means faulty fan according to the manufacturer's instructions
  • Open the boiler casing and reset the boiler
  • Check the voltage to the boiler fan. If voltage to the fan is 240V then replace the fan
  • Check resistance between neutral and live terminals on the fan. A working fan should have around 40 Ohms resistance. A faulty fan will have around 2 Ohms.
  • The part number is Q10S301001 for Keston fan for this boiler
  • Completely isolate the electricity to the boiler when replacing the fan

2017-03-03

Boilers

Worcester Highflow 400 RSF - No heating. Faulty diverter valve (87161207390)

Worcester Highflow 400 RSF - No heating. Faulty diverter valve (87161207390)

  • The boiler is constantly running and goes into lock out every so often
  • The hot water is working bu no heating
  • Open the boiler cover and check the diverter valve for leaks
  • Does the diverter valve operate? NOTE: This failure would cause cold water at the flow outlet and the boiler will cycle on the heating control stat.
  • Open a PCB casing and check if there is 230V at pin 3 of terminal X7?(Brown wire)
  • If NO Replace the control board if YES Replace the diverter valve
  • The replacement part numbers: Worcester 87161424820 D/valve Now 87161207390 : Bosch
  • Driver Board Pump Over-run 87161463120

2017-03-03

Boilers

Ariston Microgenus 32HE MFFI E34 error code Faulty fan (65102567)

Ariston Microgenus 32HE MFFI - no heating or hot water

  • The boiler pump is working but after 5 seconds the boiler goes into a lock out with an error code E34.
  • Open the boiler casing and reset the boiler
  • Check the voltage to the boiler fan. 
  • Check resistance between neutral and live terminals on the fan. A working fan should have around 40 Ohms resistance. A faulty fan will have around 2 Ohms.
  • If voltage to the fan is 240V then replace the fan
  • The part number is 65102567 for 28kw model
  • Completely isolate the electricity to the boiler when replacing the fan

2017-03-02

Showers

Bristan CART18 Faulty Push-In Thermostatic Cartridge 06734B - No hot water

If the shower temperature regulator doesn't work. If water comes out from the shower only hot or cold but from other outlets like kitchen tap and basin tap is changing then the shower thermostatic cartridge is faulty.

To replace the thermostatic cartridge isolate both hot and cold water to the shower valve. The replacement part is: Bristan Cart 18/CART18 Push-In Thermostatic Cartridge 06734B

2017-01-29

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