Hello,
I have underfloor hot water heating with three zones each controlled by a separate
Horstmann HRT4-A thermostat. This morning one zone was very hot despite thermostat set to normal temperature and the red light was not on. Other two zones were fine. Can these stats fail always on?
Grateful if anyone knows.
Thanks
I have underfloor hot water heating with three zones each controlled by a separate
Horstmann HRT4-A thermostat. This morning one zone was very hot despite thermostat set to normal temperature and the red light was not on. Other two zones were fine. Can these stats fail always on?
Grateful if anyone knows.
Thanks