T
Toneyz
Regarding the roomstat (downstairs)this needs a neutral to work efficiently.
The earth/CPC should be parked in the earth terminal or k.o box the stat could be mounted on. You should have a cable out of C.H. ON this is the timed output that feeds the stat the stat then opens the valve.
Do you know what rads are on each zone as it is not always upstairs and downstairs the 1st-floor landing may well be on the ground floor heating zone.
Is this a two story house?
what have you got upstairs and what is its location.
What I would do is strip the system down bell out each cable and make sure that there are no shorts in the cable where two cores are shorted together and start again.
The earth/CPC should be parked in the earth terminal or k.o box the stat could be mounted on. You should have a cable out of C.H. ON this is the timed output that feeds the stat the stat then opens the valve.
Do you know what rads are on each zone as it is not always upstairs and downstairs the 1st-floor landing may well be on the ground floor heating zone.
Is this a two story house?
what have you got upstairs and what is its location.
What I would do is strip the system down bell out each cable and make sure that there are no shorts in the cable where two cores are shorted together and start again.