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The coolroom motor seems not to switch off at times, especially when humid and the coolroom will freeze up, it has had a new thermosate installed and will only happen every now and again, but has been happening for a while now, and has be installed in house 4 8 years. Only problems over last 14 months.

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  • Deb Manwaring Nov 16, 2009

    Hi, i am wondering why this seems to happen when there is a weather change, ie humidity around

  • Deb Manwaring Nov 16, 2009

    Hey i was wondering why this problem seems to occur during a weather change ie humidity in the air

  • Deb Manwaring Nov 16, 2009

    Where is the best place to get a fail-safe thermostat and is this what it is called thank you

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Hi.

Ensure that the door seal is guaranteeing proper insulation, or that will be causing the problem in humid weather condition.

I assume that the thermostat replaced was the room temperature control thermostat.
There is another kind of thermostat or control to be tested.

Near to the fan and condenser coil you will find defrost system. This is needed to melt ice on cooling coil located outside the room.
The defrost system is operating continuously, at fixed intervals, or when triggered by a thermostat.
Have a technician checking defrost system.

Check the door insulation first.

Posted on Nov 16, 2009

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  • Master
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The thermostat controls a motor control relay which in turn controls the motor. When you have an intermittant problem like this, you have to use monitoring meters to find out the component that is failing to shut down.

We normally use a chart recorder that would monitor the thermostat and the control relay (and anything else in the circuit) If you don't want to go to this trouble, you could install a fail-safe thermostat that controls another motor control relay in series with the existing relay. This way if the first temp control circuit fails to operate, the second will

Posted on Nov 16, 2009

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