Question about Heat Controller PE121A Air Conditioner

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Heat controller furnace will not lite and seems to have no power ( it does )

Furnace was working 2 weeks ago just fine. Now when the thermostat calls for heat nothing happens. It does have power to it but the only thing I can get to work is the blower. I bypassed the safety switch and tried a new thermostat. please help1

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Pilot generator may be bad if you have propane heat.In some cases that can indicate a low voltage short ,or could have a bad transformer on unit

Posted on Oct 03, 2008

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Our Panasonic Heat Pump refuses to turn on. Can you help.

More than likely there is a power related issue within the furnace or the heat pump... Control power for the heat pump originates from the furnace control transformer. If you turn the thermostat fan setting to the 'on' position and the indoor fan comes on, the control transformer is delivering 24v control power to the thermostat circuit. If not, there could be an issue to resolve first. If the blower does come on, that's kinda good but it then means there could be a power or control issue within the heat pump itself. Any issue within the heat pump beyond making sure the 240v applied voltage is at the unit will usually be beyond the average homeowners capability to resolve.

I know this isn't much to go on, but there is such a tremendous volumn of issues that could be effecting the systems operation it would take pages to just scratch the surface. You are going to be limited to checking the basics, then my suggestion is to call a reputable service organization to resolve the issue.

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I posted a question about the Ultra sx 90 (Armstrong) furnace not lighting and the combustion blower keeps running. I did clean the flame sensor and no change. I also changed the spark control moduleas...

When this problem has occurred on my York furnace, the temperature limit switch had to be replaced. You may have checked this in your troubleshooting but if not, it's worth a try

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1 Answer

Furnace doesn't come on, no matter where thermostat is set

This sounds like the relay switch on the control board may be bad. I just replaced a control board last week on a Carrier unit doing the same thing. The relays are built into the control boards. To fix this you must call a luxaire dealer and they can be found at I will ask though, if you put the tstat into fan on instead of auto, does it come on? If it does, it could be a tstat issue. How you find this out is to remove the thermostat and expose the terminals. Take a small "jumper" wire and touch either one of the r terminals to the w terminal and hold it there. If the unit fires up with no problems, then it's the stat and not the board. Try jumping first and if it still won't come on, you know it's the control board. Good luck to both of you!

Mar 21, 2009 | Heating & Cooling

1 Answer

Carrier Weathermaker SXI Model 58SX8100LG Code 12

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sounds like you have a heat pump heat pumps dont work below 30* temps you should have some type of backup heat

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