IDEAL MINI C24 INTERMITTENTLY ON/OFF (VIDEO)

[Dec123]

Hi everyone i realise this is an old thread but I have a similar issue....my combo goes on and off every few seconds....i have got 1.5 water pressure and I have already taken off the heat exchanger and cleaned it...when I set the boiler to just DHW nothing at all happens....when i set it combined CH it does what you will see in the video link below.....

I have tested the NCT and it is functioning well at 11500 ohms of resistance so its not that

I have also opened the control box and pressed down the diagnostic switches which you will see in the video

I am an electrician (formerly) now school teacher therefore handy enough on things..was able to fault find the nct from the board rather than disconnect it etc..so I am hoping that someone could help me find a way to fix this without having to call someone in...video link below ...thanks all..

 

[ianmcd]

they are called NTC ( Negative Temperature Coefficient) not NCT, you can not measure the resistance while still connected to anything, as you will not get a true reading. the thermistor or NTC will change resistance depending on what temperature that it is sensing, that is how they work, I would doubt very much if your problem has anything whatsoever to do with an NTC

 

[Toby4life]

I'm having the exact same problem, boiler keeps firing up 24/7 for about 3 seconds. keep trying to blame my 'newish' smart thermostat. but that seems to be working as normal with scheduled heating settings. Has anyone found a solution for this yet? driving me insane! actual boiler temperature stays between 30 and 60 degrees when its not meant to be in use.

 

[Agile]

If you knew how you could see if the DHW demand switch is stuck on!

Tony