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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


Glowworm Betacom 24c - PCB 0020061654

GLOWWORM Betacom 24C 30C

  • The radiators are getting hot when hot water is operated
  • The diverter valve faulty OR
  • Diverter motor is faulty OR
  • PCB is faulty. Check voltage on a diverter motor
    • voltage 240V AC between 1 and 2 for heating
    • voltage 240V AC between 2 and 3 fir hot water
  • Replacement part PCB 0020061654 


Thermal Store Cylinders

Pulsacoil 2000 - faulty T1 thermistor GT153

Pulsacoil 2000 produces no hot water.

  • The water tank is full and the cylinder is hot
  • The PCB flushes twice indicating a normal operation
  • To test open the hot water tap and measure the voltage to the pump
  • If there is no voltage replace the Thermistor T1
  • The part number is Gledhill GT153



Main Combi 24 HE - Intermittent hot water. Faulty diaphragm 5111137

Main Combi 24HE boiler is constantly leaking from the bottom

  • Hot water does't always come on. It seems like the boiler is temperamental and decides by himself whether to heat the water or not. 
  • The leak doesn't affect the system pressure
  • Check the nut and the diaphragm inside the flow-switch valve. If the diaphragm has holes in it then replace the diaphragm
  • The part number is 5111137
  • To replace isolate the water supply to the boiler.
  • No need to drain the central heating


Underfloor Heating

PolyPlumb Leaking thermostatic vavle

Underfloor heating doesn't work.
Every time it switches on the fuse inside the wiring centre blows
Disconnect a wire from the pump and try again.
If the fuse doesn't blow then replace the pump
The pump damage might have been caused by a leak. 
In my case the manifold thermostat located right above the pump was leaking on it.
Replace the thermostatic vavle
The part number is Polyplumb Thermostatic Mixing Valve PB970029



Keston C55 - intermittent fault. Faulty PCB C17401000

Keston C55 system boiler goes into a lock out intermittently

The display shows different fault codes once or twice a day or every couple of days.

The PCB is faulty. Replacement part number is C17401000 or C17430000


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