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the primary flow switch is the pump proving switch. 1. is there 1.2bar on gauge. 2. is pump working (not seized.) 3. is bypass blocked. 4. is diaraghm split.

right let me explain this boiler needs not just a switch live but a permanent live for pump overrun and also pump to be wired back to boiler ok adlplumbing, yes i know the rads are getting hot but what happens when the room stat is satisfied it shuts down the zone valve which cuts off the...

i sometimes forget who im talking to i have lots of friends who are gas enigneers and often ring me for advice. it sounds like a blocked plate needs replacing dont be tight and get a gas enigneer

sounds like it is overheating, you need to make sure the pump is wired back to the boiler for pump overrun and your bypass valve if fitted is open. also needs a permanent live to boiler not just switched live.

first of all if the heating is always on but room stat and clock are set to off then it is th hw microswitch stuck closed circuit, but if it comes on when you run a hot tap then it is the diverter valve letting by, also check plate heat exchanger is clean if not replace.

the boiler has a built in frost stat to protect the boiler, but if you have exposed pipework that could freeze you need to insulate the pipe fit a frost stat and a pipe stat.

simply honeywell, they are the best in controls, they also use different wireless signals to other manufacturers which are a lot more reliable

need more info with regards to the heating always being on. you need to check the combustion box door seal, as if this is leaking it will trigger the overheat stat on the fan.

jackpike dont be such a knob we dont just sit in are van playing with are nuts. yes we generally change parts but thats the job, go there find out whats wrong then fix or replace it. if you have nothing sensible to say, say nothing.

this is a pcb fault no doubt about it, ps i work for baxi and potterton

i work for heateam and i agree with what the engineer did, you have to cover your arse, what happens if the flue comes loose and the engineer wrote or did nothing about it he would get the sack. i see a lot of crap installations and it is my job as the expert to point these faults out no matter...

need more info the three lights what are they doing solid off flashing?

yes the thermistor acts as a frost stat, the problem is your hot water microswitch front left hand side on front of pressure differential valve. push in microswitch i bet it is springy and does not have a click on and off.

did he carry out electrical safety checks ie short circuit resistance to earth? these pcbs are good as gold so i would not fit a new one yet. isolate electics go from neutral to live you need at least 20 ohms go from earth to live you need at least 2meg ohms, if these are ok its not the boiler...