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I have a Potterton Puma 80E boiler which uses a Honeywell CM67NG control. My problem is that the heating comes on when I have not instructe it to ie. I set the time to come on a 6am I sometimes wake up in the night at say 3am and the heating is on. The min temperature is 5 degs which it hasn't fallen below in the house to cause the heating to come on. Why does it keep doing this and how can I fix it?

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Posted on Jan 02, 2017

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Is the heater staying on all the time? Most likely cause of themostat trouble is the sensor. Try to find it and measure its resistance at different temps to verify the trouble.

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Posted on Nov 28, 2008

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hope this is helpful. On my potterton 24 combi boiler it is the valve that sits the lowest, with a slight indent in the black tap. if you turn this for a short period you will hear a hiss and the pressure will quickly build to the desired pressure, when you can them turn the tap back off.

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SOURCE: Heat pump cycling on and off.

It sounds as if you you have a low charge of refrigerant, r22. When the unit comes on outside, the outdoor coils become the lowside, there is a low pressure switch that is tripping out contactor protecting the compressor.

Posted on Mar 11, 2009

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SOURCE: Hi. We recently moved to a rented property. We

You definetly have a control issue. However trying to diagnose the exact problems that you have would be very difficult without actually seeing the wiring. You defintely have a wiring/control issue but I cannot tell you exactly what it is without more info. Sorry, I would love to help you more...

Posted on Nov 13, 2009

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