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Thanks for the replies... Mick, what I meant was that the cylinder stat hadn't been disconnected before I started to have problems with the breaker tripping, whereas the pump and 3 port valve had both been replaced. The yellow is a permanent 240v from terminal 1 on the programmer, a...

Hi, i'm having problems with the circuit breaker blowing on a boiler. Problem started with a faulty pump and long standing fault on a 3 port valve, Honeywell V4073A, both replaced. Breaker then started to trip when you put system on. I disconnected the pump, valve and cylinder stat, breaker...