So recently my hot water was getting excessively hot (was way over the thermostat on the hot water tank setting). Engineer came and replaced the thermostat on the tank.
This had no effect. Still got very hot water. But after he left I found the Radiators were not coming on. Manually setting the 3 port valve to open gave me very hot water and hot radiators. Engineer came back and said the 3 port valve was faulty probably due to sludge and this was not covered by insurance).
I replaced the 3 port valve myself with the identical model (Honeywell V4073A 3 Port Motorised Valve) - being very careful to wire it back in with the same wire scheme. Water that came out of the system was clean when I drained down.
Now, with the timer for both water and radiators set to OFF, when I power up the central heating (by plugging the boiler/ timer etc on) the timer remains off and the boiler ignites and provides hot water. The (new) 3 port valve makes a ticking noise.
Turning the timer for both water and rads to ON results in the the boiler switching off!
I am wondering if then the engineer made his original call and replaced the thermostat the hot tank, he wired it up right - or perhaps the timer controller is faulty. All the radiators (except the bathrooms) have thermostatic valves and there is no "overriding" room thermostat anywhere in the house. I'm not aware of a low temperature thermostat anywhere in the system either.
Any suggestions?
This had no effect. Still got very hot water. But after he left I found the Radiators were not coming on. Manually setting the 3 port valve to open gave me very hot water and hot radiators. Engineer came back and said the 3 port valve was faulty probably due to sludge and this was not covered by insurance).
I replaced the 3 port valve myself with the identical model (Honeywell V4073A 3 Port Motorised Valve) - being very careful to wire it back in with the same wire scheme. Water that came out of the system was clean when I drained down.
Now, with the timer for both water and radiators set to OFF, when I power up the central heating (by plugging the boiler/ timer etc on) the timer remains off and the boiler ignites and provides hot water. The (new) 3 port valve makes a ticking noise.
Turning the timer for both water and rads to ON results in the the boiler switching off!
I am wondering if then the engineer made his original call and replaced the thermostat the hot tank, he wired it up right - or perhaps the timer controller is faulty. All the radiators (except the bathrooms) have thermostatic valves and there is no "overriding" room thermostat anywhere in the house. I'm not aware of a low temperature thermostat anywhere in the system either.
Any suggestions?