Unnecessary bolding removed
My CH system was faulty and the temp wiring on the programmer broke. I installed a new pump and had the programmer re wired and re positioned. The CH and HW work fine on the programmer but there is a problem. If the programmer ends and the house starts to cool down and I put the CH 1 hour booster on, it either does not come on or comes on briefly and goes off again. The CH seems to need to cool down again before it will re ignite. I changed the room stat, changed the boiler overheat stat but the problem remains. As it all used bv to work fine before the broken programmer wires, is it likely to be the danfoss programmer or possibly a known fault in the grunfos pump
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