My CH system is becoming v unpredictable. Sometimes the water doesn't heat
up unless I run the radiators. Other times the boiler (oil) shows an amber
lights but doesn't run, and recently I found the immersion heater trips the
earth breaker on the consumer unit.
Now, I suspect the Zone valves. It's a 2-port system, Honeywell, fully
controlled, i.e. two valves in the airing cupboard.
Is it a hard job to replace these - could it just be the motors or
I phoned a plumber and apparently they are booked into the new year!