Question about Heating & Cooling
Fires up for HW but not for CH
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Posted on Jan 02, 2017
If the valve runs at other times, the valve is OK. you have a relay somewhere that is not sending signal to the valve when in that mode.
Trace down all the relays for that cycle and check voltage going int, coming out, and to see if the coil is enrgised.
Posted on Jan 01, 2009
may just be a defective display PCB, byt more often than not, its the more expensive main primary PCB. Ideal actualy modified this PCB, and has a pre-fix of VF on it, and is orange in colour
Posted on Mar 03, 2009
SOURCE: combi boiler no DHW
if the boiler fires when the tap is opened then the diverter valve is working ok it must be a blocked plate heat exchanger which is the stainless steel rectangular block inside the boiler connected to the pump and the mains cold water.
it will be blocked on the central heating part probably with black scale. it is possible to clean out but sometimes it is better to just change the plate. but remember to flush the system as well or the same thing will happen.
Posted on Mar 30, 2009
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