if theres any engineers on line i could do with some help. my boiler fires up and runs on dhw. if the green light for ch comes up the pressure gauge rises and after 20 seconds the boiler locks out e1 68 error (no ignition) removed the 2 way valve top and watched the pin actuater which changes when dhw or ch are called for. i pushed the pin in on the actual valve it was hard to push but was not seized. also the pump has power going to it but gets very hot. would the ch work if the pump was faulty, cheers jim