Question about Heating & Cooling
I have a Honeywell CM67 thermostat controlling under-tile heating in my bathroom. I can't program the various time zones or turn the whole thermostat off. It is running at 36degC 24 hours a day.
Posted by Anonymous on
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Posted on Jan 02, 2017
The problem is likely with the cooling system, not the thermostat itself. Either the message from the thermostat is not being received by the AC unit, the solenoid isn't turning on the unit or it can't cool properly.
First check that none of the wires to the thermostat are loose or broken. You'll have to take the face plate off to check. The conductors are very small wires and can break easily. Depending on the unit,there are 4-5 wires usually for a HVAC system. If a wire is loose, reconnect it (push it in or screw it down gently). If a wire is broken, strip (for screw terminals) a new section and reconnect it. Check for ice build up on the condenser coils. (That is often a sign of a refrigerant leak. You'll need a professional to fix it and recharge the unit.)
Do you hear the fan running? If you do, then the condenser is a likely culprit. If the fan isn't running, then the control board for the system may be bad. You may want a professional to check the system. If you tell them the make and model, the technician can bring the parts if it is a problem with the control board.
I hope this helps.
(We had the broken wires to our thermostat in the winter. A few years ago, a nearby lightning strike had the AC off in the summer due to the control board damage. The house reached 90 degrees while we waited for the repair.)
Posted on May 31, 2013
Many thermostats have battery backup as well as the 24 volt ac. Have you replaced the batteries to see if it fixes all of your issues at once?
Posted on Nov 02, 2013
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