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Can any of you experts guide me in the right direction in testing a DHW thermostat correctly. This is how I tested it I took out the temperature probe from the boiler pocket and placed it inside a cup of water at 90 plus degrees with a digital thermometer beside it. I disconnected the two...

Tested the pump overrun for volts when cooling down the system. 245 volts on the relay between 9 and 10. once stopped just under 2 volts. also 240 volts between the brown and black terminals on the pump overrun thermostat. Flow switch volts needed when not being used and when DHW is called for...

Okay oilhead No hot water. checked the voltage on the flowswitch without calling for DHW 240 volts. once the tap is turned on, the voltage drop's off to only 14.9mv between the live and neutral mv. there is a distinct sound difference when the flow switch tells the pump to open and flow, when...

I will also check the pump once hot water is called for as well. cheer's oilhead Bully

The flow switch switches on the burner once the temperature is low enough so thats seems okay. last night I had a poke about and the MCB on the comsumer board tripped off. I replaced the fuse on the main boiler switch and all is well again. what I did not mention is the original switch for...

Thank you for your reply 45yearsagasman, thats one thing less to worry about. However what I have had to do for some time is open the PRV to take out the pressure then refill the system to cool it down enough to get the hot water from the boiler, otherwise the flow switch wont turn on the...

Hi to all that can give me help in testing my Myson MSV 322/07 diverter valve. over the years I have replaced certain parts on the flowsure 70/90 and had no real bother including the actuator head. This time I think the head could be at fault again or there is no signal to tell it to operate...

Hello. I have a 1.1 L reg fiesta and will only start once running for a while. It has a electric fuel pump and its a single point injection. if the sound of the fuel pump cannot be heard then the car will not start. could it be the coolant sensor, faulty pump or ignition barrel to blame ? many...

The heating works okay just takes some time to circulate round the system. the temperature reading of the water starts at 60 degrees but as soon as you call for dhw the boiler cuts in then the temperature goes to 90 then the boiler will not cut in again until it goes back to 60. i manually...

Hi to all, I have posted a question before on no hot water coming out of my potterton oil flowsure combi boiler. since then an engineer has taken the plate heat exchanger off and chemically cleaned it out. still no hot water, but the pipes going to the diverter valve are really hot. he did say...

I have managed to have the plate exchanger taken off and chemically cleaned to good as new. now it is on and the boiler and was fired up. still the same problem, no hot water on the dhw side. the pipe that comes from the exchanger to port B on the diverter valve is piping hot and also port A...

Ok thanks will do some more detective work. However this doesn't explain why I have no hot water, surely the burner should cut in if the water is cold! Many thanks :)

Also is it a possibility that the heat exchanger could be scaled up too much? the reason I ask is the other day I had piping hot water and today just warm water.

So why do you think there is no hot water is not coming out?

Hi again. I have some more information on the boiler. when the boiler is at 70 degrees. I can turn the dhw tap on and it will start as normal,but the water is only just warm. I tested it by turning it off and on three times and it turned off then on as it should do. as soon as it reaches 90...

Hi to all. I have a baxi potterton oil boiler. when it starts from cold it is fine but when it reaches it's full temperature at 85 to 90 degrees the burner does not cut in when the hot tap is on. the flow switch cuts in and I have measured the voltage which is 240 volts and also the relay...