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I had the 3 way valve replaced by a plumber, and every time the heating or water fires up the pipes vibrate, like water hammer (ie for about 1 second). The plumber came back, replaced the valve again, but it is still bad. I have tried to bleed the system, in case there is an airlock. If I...

Hi. I have replced a Danfoss Set 5 programmer with a Danfoss FP715. I followed (I thought) the wiring conversions with the instructions, but as soon as I turn on the power, the boiler fires up, even if the programmer is set to off. The boiler turns off after about 5 minutes (I assume when the...