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Question DetailsAsked on 1/30/2017

Is the txv replaced when indoor evap coil is replaced? has leak, coil replaced 4 months ago. No heat is symptom.

Heat pump is Lennox, 7 years old. Evap coil replaced 4 months ago. Now can see bubbling at txv valve. Is this txv leak fault of evap coil install ? Is it normally tested/repaired/replaced when coil is installed?

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2 Answers



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Answered 3 years ago by Member Services


Only if it was malfunctioning or the wrong one (if non-adjustable type) for the installation - usually with a leaking evaporator coil only the coil is replaced - plus the gas recharged of course. Check the invoice for the coil replacement - should say TXV (or similar looking letters) or gas regulating valve or such in the list of parts replaced and charged for if it was replaced - and the scope of work description would presumably have said something like "gas valve replaced to correct improper operating pressures" or "gas valve (or TXV valve) defective - replaced" or some similar phrasing.

It is also possible that you had two leaks at the time and he did not run a leak check on the entire system, or worse that he assumed the evaporator coil was the leak source so replaced it without tracking down the actual leak source at all - it happens.

As for testing/replacement - would be adjusted as necessary to get the proper operating pressures on the 'high" and "low" side of the system, but would not normally be "tested" as such unless there was reason to suspect something was wrong. It is possible you ahve developed a new thread leak, could be it started leaking because pressure was removed on it when the coil was replaced so a fitting opened up, etc.

If coming out of the threads where it connects into the tubing, should be an easy fox - probably $100-200 range. If coming out of the valve core itself, probably needs replacing - you can google this search phrase - TXV valve angies list - to see a few previous questions with answers on ballpark typical replacement costs. Of course, some brands are higher, some lower, and local labor costs matter somewhat too.

Answered 3 years ago by LCD

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