Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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Have a round automag thermostat

Temp is set to 50 degrees....it is eighty in here....help!!

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SOURCE: Rinnai rce-606tra II -- temperature is wrong

move thermister probe higher on back of unit

Posted on Mar 10, 2008


Accurate Joe
  • 61 Answers

SOURCE: heat pump auxiliary heat does not turn on

Turn up your outside thermostat in the outside unit.
You should have about 3 degrees difference in one stage to the next. So I would change the thermosat with one that has three stages of heat.

Posted on Nov 30, 2008

  • 11 Answers

SOURCE: I have a new Honeywell Round Non-Programmable Heat

Make sure the switches on the back of the thermostat is set for hot water heat. If you have more then 1 zone you may a stuck zone valve or a short in the wiring somewhere keeping the boiler on.

Posted on Apr 02, 2010

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How many degrees before it reaches desired temp, does it shut off? A thermostat is designed to shut the furnace off a couple/ few degrees before it reaches set temp. It has what is called a heat anticipater, which shuts the burner down, and lets the blower use the remaining heat from the heat exchanger to bring it up to desired temp making it more efficient. If it is more than a few degrees, replace the thermostat. You can jump out the red and white wires to confirm the faulty thermostat. If by doing this, the furnace never shuts down, until you separate the red and white wires. That confirms a faulty thermostat. Hope this helps someone.

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I use my house furnace thermostat mounted half way up the wall as a guide, When the temp outside is in the teens, I have seen as much difference between the floor temp on the heater and the wall to be 4-6 degrees different. So this means as the tempurature outside drops you need to regulate the thermostat on the heater downward to compensate for the colder floor temperatures.

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Heat pump auxiliary heat does not turn on


Turn up your outside thermostat in the outside unit.
You should have about 3 degrees difference in one stage to the next. So I would change the thermosat with one that has three stages of heat.

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I just got my G73.  It comes with a new note that says "below 50 degrees the fan will cycle randomly (and might seem like its not working correctly) but once it is above 50 it will cycle normally."  it uses that to let the element re-heat quickly to bring the room up to temp faster.

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