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potterton promax 33 he issues

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plumbbobshan

Gas Engineer
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79
Afternoon lads and lasses , having some issues with this boiler . Heating working fine. Hot water keeps dropping in and out !!!
Recently had new diverter cartridge and motorised head as the hot water was going into the heating and hot water sensor (green wires) and its reaching 90 and then turning off ?
Could the plate heat exchanger need a de coke or is it something else ?
Thanks in Anticipation
 
Sounds like aslong as the diverter is working properly plate
 

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