Halstead Qauttro does not fire up. few years ado it did the same thing,I rang Halstead technical help line the advised me to push down a red knop on the DH thermostat which I did. However, this red knop is sticking out and no matter what I do it done not go down. I believe this is what stopping the boiler to fire. can I by pass by connection the two wire going in to it for very short time to see if the boiler fires. the only part is working when there a demand for DHW or CH is the pump and the diverter valve.