We’ve got a dodgy combi boiler which will now only dispense hot water anywhere in the house if we turn on the tap we want to use (or shower) and then turn on the hot tap in the downstairs bathroom on full until the hot water kicks in.

A British Gas engineer came out a few months ago and replaced the heat transfer plate but since then it’s got worse and sometimes we have to turn the hot tap in the bathroom on and off several times before the hot water kicks in.

Now, I’ve done my research and the symptoms seem to point to the same 4 possible faults.  Either the diaphragm is buggered (this is something to do with operating the switch that kicks the heater in), the Domestic Hot Water Sensor is buggered (this senses when the water is hot), the diverter is buggered (this decides whether the water goes past the heat transfer plate or not) or the flow valve is buggered (this regulates the amount of water flowing through the boiler).

I’m not a plumber or gas engineer but I can see how all 4 of those could affect the boiler.  Question is, will the British Gas engineer coming tomorrow?