Problem with Trane XR15

[545GAlady]

I had a 3.5 ton Trane XR15 heat pump installed last April. The unit replaced a 2002 Lennox 3.5 ton air conditioner (don't know the exact model number). The HVAC company did do a proper load calculation and said we were fine with 3.5 tons. The unit has performed flawlessly in COOL mode, but it seems to perform kinda weird in HEAT mode.

The unit heats and cools the main level of my house, and the main level is about 2200 sq ft. It is matched up with a 2002 Lennox G40 90,000 BTU input gas furnace with a 4 ton blower. So, the whole system is a dual fuel system.

I turned the heat on this morning and while it was running the heat pump outside turned off for a few seconds then turned back on. Then about a minute later it did the exact same thing. The blower stayed on the whole time and the thermostat still said "heat on". After a few minutes the heat pump turned off again for a few seconds and then back on, and it kept doing it repeatedly until the heat cycle ended.

Could this lead to anything bigger in the future? Is there something wrong with the unit? The unit doesn't do this at all in cooling mode.

Thanks

[heresjohnnyb]

You need a service tech. ASAP. The heat pump is cycling off of high pressure switch. Ensure they add the dual fuel kit or fix their wiring. Trust me

[jtrammel]

Call for service, could damage equipment

[545GAlady]

Thanks. I forgot to mention that we are having our yearly fall tune-up done next Monday, and we probably won't need the heat within the next several days. So I might just mention it to the tech when he comes.

[mark beiser]

Did they replace the indoor coil too?

If the indoor coil has a cooling only TXV, it won't allow proper refrigerant flow in the heating mode.

[545GAlady]

Did they replace the indoor coil too?

If the indoor coil has a cooling only TXV, it won't allow proper refrigerant flow in the heating mode.

Yeah, they did replace the indoor coil also. I'll post some pics of the whole system.

[mark beiser]

Yeah, they did replace the indoor coil also. I'll post some pics of the whole system.

Post the model numbers of the heat pump and indoor coil too.

[545GAlady]

Here's the system. I couldn't get a picture of the evaporator coil model number because the furnace flue pipe was in the way. At least I was still able to read it though, so here it is:

4TXCBO42BC3HCBA

[dan sw fl]

So I might just mention it to the tech when he comes.

OK, & if you forget to mention it..
---Call him back in a little while so you can tell him xxx the unit just died xxxx

[second opinion]

Here's the system. I couldn't get a picture of the evaporator coil model number because the furnace flue pipe was in the way. At least I was still able to read it though, so here it is:

4TXCBO42BC3HCBA

What is the model # of new Tstat?

[545GAlady]

What is the model # of new Tstat?

Model number is YTH9421C1002

Honeywell VisionPRO IAQ

[mark beiser]

What is the model number of the indoor coil, green box on top of the furnace, has copper and PVC pipes going to it.

[545GAlady]

What is the model number of the indoor coil, green box on top of the furnace, has copper and PVC pipes going to it.

I already mentioned the indoor coil model number in one of my previous posts. Here it is again:

4TXCBO42BC3HCBA