I have a conventional heating system. Gas boiler with radiators and a hot cylinder. Heating has a single thermostat in the hall and the water, a thermostat on the cylinder. There are two zone valves (Drayton ZA5), one for the hot water and one for the radiators.
The problem is that the hot water is now heating all the time. The boiler cycles on and off (I assume according to its own thermostat) and the pump in the boiler is running all the time. The programmer (Hive) has the hot water and the heating OFF.
I can move the spring-loaded levers on both the zone valves. i.e. They aren't stuck. I have replaced both zone valve actuators as this has happened before. Everything has been ok for a while, but now the problem has returned.
What else can I check? Thanks for any suggestions or troubleshooting tips.
Julian
The problem is that the hot water is now heating all the time. The boiler cycles on and off (I assume according to its own thermostat) and the pump in the boiler is running all the time. The programmer (Hive) has the hot water and the heating OFF.
I can move the spring-loaded levers on both the zone valves. i.e. They aren't stuck. I have replaced both zone valve actuators as this has happened before. Everything has been ok for a while, but now the problem has returned.
What else can I check? Thanks for any suggestions or troubleshooting tips.
Julian