I've got 2 thermostats, upstairs and downstairs.
Downstairs thermostat was calling for heat but boiler did not react. Then I called for upstairs and boiler got the signal and the rads upstairs started heating (downstairs not calling for heat).
Swapped the thermostats, issue remained (so possibly not the thermostats).
Something peculiar, I called downstairs, nothing, then I called both up and down and the downstairs rads started working as well.
But as soon as upstairs is off, it's off again, regardless of downstairs calling for heat or not.
I have removed the thermostat and connected live and switched live directly with downstairs only and it still isn't calling for heat. Any ideas?
Downstairs thermostat was calling for heat but boiler did not react. Then I called for upstairs and boiler got the signal and the rads upstairs started heating (downstairs not calling for heat).
Swapped the thermostats, issue remained (so possibly not the thermostats).
Something peculiar, I called downstairs, nothing, then I called both up and down and the downstairs rads started working as well.
But as soon as upstairs is off, it's off again, regardless of downstairs calling for heat or not.
I have removed the thermostat and connected live and switched live directly with downstairs only and it still isn't calling for heat. Any ideas?