Hi,
My gas central heating and water seemed to come on and stay on randomly. So I sat down and went through every combination of Timer Setting / CH Thermostat / Tank Thermostat to see precisely where the issue was.
If you look at the attached matrix, you'll see that there are two specific scenarios that causes 'weird stuff' to happen.
The first is where the CH & HW are OFF at the Timer, but when the Room Thermostat calls for heat the Boiler fires up.
The second is where the CH is ON and HW is OFF - Room Thermostat is NOT calling for heat but the HW thermostat is - this results in the boiler firing up but the valve stays at H meaning!
From the info provided, can anyone suggest what may be wrong with the wiring?
Thanks,
Nozzy
My gas central heating and water seemed to come on and stay on randomly. So I sat down and went through every combination of Timer Setting / CH Thermostat / Tank Thermostat to see precisely where the issue was.
If you look at the attached matrix, you'll see that there are two specific scenarios that causes 'weird stuff' to happen.
The first is where the CH & HW are OFF at the Timer, but when the Room Thermostat calls for heat the Boiler fires up.
The second is where the CH is ON and HW is OFF - Room Thermostat is NOT calling for heat but the HW thermostat is - this results in the boiler firing up but the valve stays at H meaning!
From the info provided, can anyone suggest what may be wrong with the wiring?
Thanks,
Nozzy