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My honeywell programable thermostat (PC8900) has a mind of its own. Even though it is programed, at times it will continue to run without homeowners input. Temp set for 75 and continues to run at time below 70 until interupted.

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6 Suggested Answers

  • 5 Answers

SOURCE: I HAVE PROBLEMS WITH MY

t87 usually are about 5 degrees off. sometimes more because of dirt and dust.get a digital

Posted on Aug 28, 2008

  • 52 Answers

SOURCE: Improper Termperature Readings during AC run

personally i'd just replace the thermostat, but try pulling the front panel off and look on the circuit board and see if there is a jumper for F/C or any other settings. you may try changing its position. you can also remove the batteries for 15 minutes and see if it resets itself. the only other thing it could be is a wiring issue.

Posted on May 29, 2009

mikeangie304
  • 15 Answers

SOURCE: Our thermostat is set at hold with the fan on

it is ok to run your fan continously. constant air filtering as long as it pauses before a/c cycles on. will not use any more electricity than a toaster. is there a fan programing feature on t-stat. if so you will need to turn programing to fan off

Posted on Aug 20, 2009

  • 363 Answers

SOURCE: the fan runs continuously, with thermostat set to

When was the last time you had the coils in the condenser cleaned. Dirty coils can insulate the refrigerant tubes, causing the fan to constantly run in order to try and cool down the refrigerant returning from the evaporator coils(a-coils) in supply ducting, But can.t because the condenser coils are insulated not allowing the heat to escape. I would try this first before replacing expensive parts. It is the small things that we overlook that is most likely the source

Posted on Aug 22, 2009

  • 29 Answers

SOURCE: Outside unit runs continuously, even when system is off.

On A/C units, there is a low voltage line that leads to a contactor, which engages to close the high voltage circuit to the condensor unit. Over time, the accual contacts in the contactor can weld themselves together. Try shutting off your furnace breaker but leaving on the one for the outside condensor unit. If it still runs, your contactor probably needs replaced. Contact a licensed electrician or HVAC contractor and tell them you think your contactor is in need of replacement. Is a fairly simple and quick replace, but the contactor itself is not cheap.

Posted on Oct 10, 2009

  • 117 Answers

SOURCE: I have my thermostat set to 75 degrees however my

How old is your system?

If your system is a heat pump and is failing to keep up overnight during the colder weather. Or if it struggles to keep up at all, a few issues come to mind.


Obviously, the first and most common cause would be due to an undercharge of refrigerant. With an undercharge, your heat pump has lost efficiency and cannot properly remove heat from outside.


Other possible issues that come to mind are failed defrost cycle. If your unit is not defrosting properly and it continues to run non-stop, a freeze-up could occur on the outdoor coil. And the worse it gets, the worse your system will perform.

Another possibility is auxiliary heat or heat strips are not coming on at all. Depending on your thermostat, you would be able to tell if the thermostat is calling for auxiliary heat. If you are not getting any additional heat, then the heat pump may not be adequate for the space intended.


Other smaller factors may come into play such as incorrect defrost cycles. Possibly a mechanical component taking a break or overheating or maybe a mechanical failure such as failed compressor leaving the only heat you have as emergency.



Posted on Jan 09, 2010

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