Potterton promax boiler...
5 years installed with problems then out of blue 2 downstairs radiators not heating up.
If I turn off the valves of the upstairs 2 then the downstairs 2 get hot.
Hot water works fine.
Plumber tried thermistor, pump head and also the divertor valve no different.
2nd thing is when the heating is on and boiler reaches 85ish the heating knocks off like it would if the room had come up to temperature in the room thermostat. It drops to about 40 then does the same, rinse and repeat. All the while the room isn't coming up to temperature.
Plumber says he's no idea now and can do no more.
Any ideas?????
5 years installed with problems then out of blue 2 downstairs radiators not heating up.
If I turn off the valves of the upstairs 2 then the downstairs 2 get hot.
Hot water works fine.
Plumber tried thermistor, pump head and also the divertor valve no different.
2nd thing is when the heating is on and boiler reaches 85ish the heating knocks off like it would if the room had come up to temperature in the room thermostat. It drops to about 40 then does the same, rinse and repeat. All the while the room isn't coming up to temperature.
Plumber says he's no idea now and can do no more.
Any ideas?????
