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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


Vaillant ecoTec Plus 637 F.75 Fault Pump replacement 0020025042

Vaillant ecoTec Plus 637 F.75 Fault

  • Boiler is not working and fault code F.75 is showing.
  • Check the power to the pump 240v when boiler deman is on
  • If there is power then open the pump vent screw (small amount of water will escape)
  • With a screwdriver check if the impeller is rotating
  • If its rotating try to stop it with the screwdriver
  • If its easy to stop then replae the pump

Pump replacement  part number is 0020025042



Potterton Suprima 80 HE - Faulty PCB (SM10501U)

Potterton Suprima 80 HE - pump overun doesn't work

  • Boiler occasionally goes to an overheat lockout
  • The pump is wired to a PCB pump connection to provide 2 minutes pump override in order to get rid of the het from the main heat exchanger.
  • The faulty part is PCB - part number is SM10501U



Worcester 532/i - Error C6, Faulty fan 87161160670; 87172044530; 8716118443

Worcester 532/i - No heating, no hot water, the boiler displays an error code C6 

  • Check the power to the fan between brown and purple wires. If there is 240v but fan is not working replace the fan. 
  • Faulty part is fan - replacement part 87161160670; 87172044530; 8716118443



Mira Discovery - Constantly leaking from a shower head (Flow Control 1.1609.042.2)

Mira Shower Discovery is constantly leaking from a shower head.

The flow cartridge is faulty. Isolate the water supply before removing the cartridge

The part number is - Flow Control 1.1609.042.2 



Nibe F205P - hot water low pressure after 1 minute

Nibe F205P heat pump produces very low pressure hot water.
Hot water pressure is strong when you first open a tap but then gradually reduces to a trickle.
The fault is a Pressure Reducing Valve (PRV) is faulty.
Replace the PRV. Replacement part is - 520-467-0829 Pre-Set at 3.5 Bar - 330 Series Domestic Pressure Reducing Limiting Valve with Cold Take Off - PRED330006 
‚ÄčIsolate water from the mains stop cock before replacing the part.


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