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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


Main System HE - Flame goes off after 10 seconds.

The PCB is faulty (5112380) or flame sensing electrode is not positioned correctly or broken. If there is 1µA current on a sensing electrode, then PCB need replacement. Otherwise the sensing electrode. Main technical support number is 0844 871 1570. The gas valve is faulty if when boiler is in the lock out there are 20 VDC across two black wires for the main solenoid valve.

Boiler manual PDF.



Crosswater SME-029 Thermostatic shower - Temperature and pressure problem

Crosswater Designer wall outlet hose attachment, Thermostatic shower valve with bath spout and diverter or shower option SME-029. A problem with water temperature. The water is too cold when you turn the temperature to maximum. Termostat adjustment doesnt make water any wormer. Cartridge have to be replaced. The manufacturers website. The cartridge part number is SC50-T20 and it can be ordered from here.


Hot Water Cylinders

Megaflow The cylinder is not heating up Immersion Heater replacement

Hot water cylinder stopped working and you dont have any hot water. Check first an immersion heater fuse on a consumer unit. Is a cable life to the heater? If not it might be on economy 7 supply. Is there 240V between blue and brown? Is there resistance around 190 Omhs?



Geberit AP109 - Flush valve is letting-by

Geberit AP109 cistern code is 109.720.00.1 which has a dual flush valve with activation unit.


  • Flush valve - 241.415.00.1
  • Activation unit - 240.574.00.1

Technical service contact information: robert.byrne@geberit.com Tel: 01926 516 820



Vokera Sabre 25HE - Boiler quickly loosing pressure

The boiler keeps loosing pressure up to 0 within 3 hours.

Boiler manual in PDF

Pressure relief valve (PRV) is letting by. How to check? Top up the pressure up to 1 bar by opening a filling loop and then have a look at the pressure discharge pipe termination if its dripping or not. If its dripping with pressure gauge readings up to 3 bars then the PRV need replacement. The part number is 10025055 and you can order it here.

Expansion vessel has lost its charge or diaphragm has split. How to check? Find the expansion vessel at the back of the boiler and push a nipple down. If there is a water coming instead of air then the expansion vessel need replacement. Due to incontinent design of this model its easier to fit an external expansion vessel 8 litres. Undercharged expansion vessel can be checked by turning the heating on and observing the pressure - it should shoot up to 3 bars and PRV starts discharging excessive water.

Its also worth to check a radiator valves for leaks - its a very common reason.


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