Question about Honeywell Heating & Cooling

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My 9 year old Honeywell T8001C has no display. My FAU AC power breaker is not tripped. I tried a new Honeywell RTH2510B and a RTH7500D but the Fan does not come on with either of the new units after waiting 15 minutes even though the heat on is displayed on the screen. The 7500D says there is an option to be battery free (just like the T8001C) but it is not in the Manuals for set up or operation.

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  • Master
  • 1,196 Answers

This is why battery powered tstats are misleading. The battery provides the power to the tstat but your unit is not providing low voltage in order to run. Air conditioners are controlled by relays and contactors. This means your unit constantly has high voltage going to it but each component runs through a relay in order to turn on. These relays are energized by the low voltage that runs through your tstat. Your tstat is not getting this low voltage. Either your float switch on your drain line is tripped, your blade style fuse is blown on the secondary side of the transformer or your transformer is bad.

Posted on Aug 09, 2017

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Posted on Jan 02, 2017

Therinnaiguy
  • 1420 Answers

SOURCE: no cooling after power out, indicator lights pattern not in manual

The Mitsubishi units have to be reset by turning off the indoor units by switching the remote or thermostat to off. Then turn off the breaker to the outside unit(s). After 30 seconds,turn on the breaker and then you can turn on the remote for cool. If no lights come on on the inside units, most likely you have blown a fuse soldered on the main PC board. At this point, call your technician. A goos tech will be able to wire in an in-line fuse holder so if it should happen again, you can easily replace the fuse. If you do see a light or two come on at the indoor unit but the outdoor unit does not start after 3 or 4 minutes, sounds like you will need to call a technician. Most likely you have a blown fuse on the main PC board of the outside unit. It is not an easy one to replace. Good Luck!

Posted on Sep 04, 2007

TJBENGR
  • 121 Answers

SOURCE: how to change the battery

The battery is inside the thermostat. There should be screws / or / it will just pry off the mounting base (not the wall). There are usually rechargable batteries inside.

Posted on Apr 28, 2008

koolbreezes
  • 540 Answers

SOURCE: AC breaker trips after 10 minutes

Whats the amp breaker? Is this for the inside unit or the outside condenser? If the inside and gas heat you have a bad fan motor, If its an electric furnace , the same, but if its the outside unit, the fan could be going bad, locking up and the compressor still runs and pulls high ampsand tripps breaker or the compressor is just pulling too many amps due to plugged coils with dirt , grass or weeds blocking airflow.(koolbreezes74401@yahoo.com)

Posted on Jun 09, 2008

  • 33 Answers

SOURCE: carrier central airconditioning heat unit - breaker trips when cooling turned on

well mineswas a blowen compressor

Posted on Jul 19, 2008

  • 2 Answers

SOURCE: 579 series, 13.5K BTU Rooftop trips AC circuit breaker in hot weather...

Is your condensing unit located in a well ventilated area and have an ample space, atleast a foot, from the rooftop flooring? Just make a check that free flowing outside air properly ventilates the condensing unit specially on high ambient temperatures. Hope this would solve your problem

Posted on Sep 16, 2008

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Is the indoor unit operating? If no turn the fan from auto to on at thermostat. If the fan comes on, that is a sign that you have 24volts
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Turn AC unit off outside,turn the thermostat as low as it will go. Open the electrical panel to the outdoor unit. There is a contactor located in the unit, push the plastic bar in the middle of contactor. If it pushes
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Trying to replace honeywell T8001C thermostat with new honeywell RTH7600. The old had a brown not used & a blue. On the new unit not sure where they go. Hooked it up with red,yellow,white,green &...


Red is usually hot side of transformer,yellow is for the a/c compressor,white is for heater,green is for the blower fan,now the blue could be energize for heat or the common side for the transformer,brown can also be the common side of the transformer. It sounds like you need the blue wire connected to the common side for the thermostat....but be careful. Some units use this as a energize wire and are not a common. I would find out what furnace model you have then look online and double check what this wire is or you could damage the new thermostat and/or the 24 volt system on your fau. And also always have the power to the unit disconnected so you do not ground a circuit.

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Hi, take a look on amazon for replacement, here: Defy Mother Nature with our Best Buy. I hope this was helpful. Cheers

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