I have an old floor standing gas boiler CH system with hot water storage tank.
This has worked just fine for few years. The only things needing replaced were the HW/CH valves that control the water flow.
Problem
The control unit
Horstmann Centaurplus C27 Heating Programmer
broke about a year ago so I replaced it. The replacement only lasted about nine months, I figured I had a duff unit and replaced it again. The new one has gone after about three months.
They all broke in the same way. Unit appearers to be working, all timing and lights work as normal however the boiler turns on and stays on no matter what the unit is set to.
The unit appears to suppress the boiler operation. If it is removed completely the boiler stays on for both HW & CH.
There is a fused switch that supplies the power to the unit backplate and I can turn this off to turn off the boiler.
Has anyone experienced this before? Or got any ideas. I don't know if it is a system of the CH system or there is a problem with the house electrics.
This has worked just fine for few years. The only things needing replaced were the HW/CH valves that control the water flow.
Problem
The control unit
Horstmann Centaurplus C27 Heating Programmer
broke about a year ago so I replaced it. The replacement only lasted about nine months, I figured I had a duff unit and replaced it again. The new one has gone after about three months.
They all broke in the same way. Unit appearers to be working, all timing and lights work as normal however the boiler turns on and stays on no matter what the unit is set to.
The unit appears to suppress the boiler operation. If it is removed completely the boiler stays on for both HW & CH.
There is a fused switch that supplies the power to the unit backplate and I can turn this off to turn off the boiler.
Has anyone experienced this before? Or got any ideas. I don't know if it is a system of the CH system or there is a problem with the house electrics.