Trane XE 1000 Weathertron Heat Pump


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Old 10-10-17, 10:11 PM
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Trane XE 1000 Weathertron Heat Pump

Hello All!

Thanks to Doityourself.com for providing a forum to ask questions.

It has started to cool down and decided to turn the furnace on tonite, first time in a long time. It's in the 40s. Set the selector on the thermostat (BAYSTAT239) from OFF to Heat. When it kicked on it ran for a while and I didn't pay much attention to it. Then apparently the blue AUX light came on and I could smell the dust burning off the toasters (annual ritual the first time of the season) but that just nukes the electricity bill so I turned the thermostat down. Then I noticed the heat pump wasn't doing much. I went downstairs and looked at the air handler. The big copper pipe going into the air handler was cold, and had condensation on it and the drain pipe was dripping water like it does on a hot humid day. Eventually I determined that all the breakers are good, the outside unit has power but neither fan nor compressor is kicking on outside unit when either AC or heat is selected.

What's strange is at one point in my fumbling I tried to turn the AUX heat toasters on, the blue light on the thermostat illuminates but they don't seem to be working at all now. I turned EMERG heat on and seemed to get a little bit out of that, but since the outside unit isn't working at all am worried about compressor being damaged.

2 or 3 years ago in the spring I replaced some parts in the outside unit - the contactor, start/motor run capacitor, and the fan on general principles, as it is an older unit and didn't want to wait for them to fail. The previous summer to all that stuff I had an HVAC guy come out to the house and check everything. He checked some pressures on the outside unit, and I had him replace the air handler motor capacitor. Said he needed to check the refrigerant in both hot and cold weather, but I never bothered to call them back.

Anyway we've got reasonable weather for now, what I'd like to know if there's some reasonable steps I can take to troubleshoot and maybe eliminate easy stuff before calling in the pros. The power cutoff breaker is installed at the outside box and the fan itself doesn't seem to be locked up - I was able to spin it anyway. Not very scientific - I found a stick and reached through the top.

Thinking maybe a bad contactor or motor capacitor? Thing is, they are relatively new. Or the defrost control board. There are some smaller low voltage capacitors on the board that I should have replaced on general principles when I did the other preventive maintenance. Any advice what to look for would be appreciated. Thanks again. Ted
 
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Old 10-10-17, 11:50 PM
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Update: I dunno. I messed around with it a bit. Seems to be working fine now, for the moment. The toasters (strip heat) are working now, they definitely weren't kicking on at all, AUX light illuminated and cold air through registers. Never had that happen. Typically whenever they come on regardless of thermostat setting or outside temperature it gets hot quick.

Outside unit is coming on, heat pump etc. For a while I figured that it was the strip heat that may have failed. They sure are proud of those things, too, I looked at prices.

One thing I noticed, at the air handler the condensation drain sure seems to be discharging a lot and making glugging noises, like there's a lot of water backed up in the air handler somewhere. I don't ever remember seeing condensation drip in heat mode.
 
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Old 10-11-17, 10:16 AM
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Should not see condensate in heat mode, must be running in cooling mode.
 
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Old 10-11-17, 11:08 AM
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Well I wondered about that. I had the heat on if that's what you mean. Where did all the water come from? Leftover from summertime?

Furnace ran overnight as required. Drip tube area seems dry now.

It's not cold yet 52 right now. Just cycled the thermostat up and it's putting out nice heat pump heat - I had to check to make sure the toasters weren't on. I like heat pumps for their efficiency - they work OK until it gets down to around 20 say. In that freezing to 50ish range they are great. Much below 0, especially high winds, and they run constantly. House well insulated.

Could it it be when I first turned on the furnace this year, it went into defrost mode, or a valve or relay is sticky or somesuch?
 

Last edited by Tedsterr; 10-11-17 at 12:43 PM.
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Old 10-11-17, 12:56 PM
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It could be the reversing valve was temporally stuck.
 
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Old 10-11-17, 04:56 PM
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OK, That type of problem doesn't fix itself and is likely to return? It's getting long in the tooth as a system but it works fine, is there other preventive maintenance that is advisable, known components in the same vein as motor run capacitors and contactors? When it is no longer economical to repair that's one thing but a hundred bucks every now and then will work for me if it keeps chugging along. Thanks for the help.
 
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Old 10-16-17, 05:29 PM
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More weirdness

So today was nice weather, about 65 with sunshine. Since this is a split level I like to just run the fan and get air circulating. I keep the thermostat set very low, but also turn the Heat/OFF/AC switch to OFF.

But warm air, even almost hot, was coming out of the registers. Outside unit not running. ?!?
 
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Old 10-16-17, 05:35 PM
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Does any of the ductwork run thru areas where the sun heats..... like the attic and outside walls ? Just drawing the warm air out of a room will move it to another room.
 
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Old 10-16-17, 07:20 PM
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No, this was definitely heat. I checked the laundry room vent, and it was hot air right there too. How is that even possible? The heat pump wasn't on, so it's the heat strips malfunctioning? Yeesh.
 
 

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