Honeywell Thermostat L641A1039

[idiott]

Hello Folks,

Before I ask for help, I would like to thank members for helping me solve various problems in the past.

Question ?
I would like to know if my Thermostat (above) is at fault or the motorised valve. I have 2 motorised valves. In short I believe the water is far above the 60 degree temperature required.

I have ordered a new thermostat. I hope it will be easy to fit if that is the fault. I (am competent at this kind of work).

As you can guess I have a relatively new system with a Vaillant boiler.

Thank you for your help

 

[hertsboilers]

You need a pro heating engineer armed with thermal reading devices to calibrate your temp setting first.

 

[JohnD]

I believe the water is far above the 60 degree temperature required.

You mean the tap water? Buy a thermometer and turn your belief into knowledge.

You have already checked that the stat is tightly strapped to the cylinder, the knob is set to 60, and it clicks when you turn it up or down?