CH continues on even after HW and CH switched off at programmer and thermostat turned right down.
Replaced CH motor valve (Sunvic SZ2301) and system was switched off upon going live but after testing the system stayed on again. Changed room thermostat but made no difference.
Any ideas?
Replaced CH motor valve (Sunvic SZ2301) and system was switched off upon going live but after testing the system stayed on again. Changed room thermostat but made no difference.
Any ideas?