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Discussion Starter · #1 ·
i have a trane heat pump that is acting weird. works properly in a/c mode but when in heat mode the high and low side pressures are both around 325psi. i talked with trane tech support but no help. any ideas would be appreciated! model #2twb3018a1000ar
 

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Sounds like you took your readings on the service valve schrader fittings. They should be about the same in heat mode then. Need to use the true suction fitting.
 

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Discussion Starter · #4 ·
Sounds like you took your readings on the service valve schrader fittings. They should be about the same in heat mode then. Need to use the true suction fitting.
i work at an apt complex and we have app. 450 goodman hp's and 2 or 3 tranes, so i'm not familiar with them at all. there are only 2 service valves that i can see- high and low side. i'll look at it again today. thanks
 

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I had a similar failure on my Trane system last year. It turned out to be the expansion valve on the outdoor unit went out.

Is your unit going into frequent defrosts even when the weather is only moderately cool? Pull the cover off the outdoor unit, and see if the expansion valve is getting frosty. If so, the expansion valve needs replacement. My high side readings were really high, and my low side went really low when this occured
 

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3rd port will be in the side panel near the RV.
 
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