Lennox CBX26UH not heating


Old 02-18-13, 05:38 PM
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Lennox CBX26UH not heating

I have a Lennox CBX26UH-036-230-1 air handler with Honeywell TH6000 thermostats and dual-zone HZ221 controller. This is a heat-pump unit with installed emergency heat. Last week the power went out and since then, I think I have no heat. It was warm last week so I didn't notice until Friday, and was out of town until Monday. Now it's 58* inside. This is in Charleston, SC, where it's been about 30* at night and 50* during the day.

I understand that the low temps may make the heat pump not work very well, but from what I read at 5* below the setpoint, the emergency heat should turn on, and heat the house up quickly. The thermostat is set to "heat" to 75*, and "Auxiliary Heat On" is displayed, indicating that the emergency heat SHOULD be operating. However, it is still only 61* inside, and thats probably due to it heating up outside and using a space heater in the bedroom.

What could be the cause? I called ARS Rooter today and they just came and charged me $90 to tell me it was working fine (the air coming out of the vents was less than 65*; obviously not fine), and its been running for the last 9 hours on this setting and temperature has not gone up at all. My work schedule really doesn't allow me to sit at home waiting for them again, so I'm trying to see if I can fix it. All circuit breakers are shut. Are there any fuses I should be looking for? I consider myself a decent handyman, but there's just no documentation for this stuff for me to reference.

Sorry for the long post, but I wanted to be as detailed as possible! Thanks for your help!
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Old 02-18-13, 06:45 PM
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Join Date: Jan 2011
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First check your filter, next make sure the HP is running, next would be to check voltages. Have you tried using emergency heat alone? This may have to be done at the zone panel.
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