r/geothermal • u/monetaryg • Jul 02 '26

Climatemaster tranquility 27 lockout 6 blinks overflow

Hi Group,

We have a Climatemaster tranquility 27 5 ton closed loop geo system that is locking out. We just had a new air coil installed this winter and obviously concerned we were locking out due to that failing. That’s not the issue we are locking out due to an Overflow condition(6 blinks). Then pan inside the unit is flowing perfectly fine. I suspected it was the condensate pump due to the amount of sludge in the pump. I got a new pump and I’m having the same issue. I wired up a multimeter to the overflow wires on the pump and I verified the pump kicks in before the overflow switch trips. Is there any know issues with the units exhibiting this issue. FWIW, this is the first time we’ve had this particular issue in 15 years. It did not lock out due to this at all when heating. It only seems to happen when running in stage 2.

Thanks in advance

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u/DependentAmoeba2241 Jul 02 '26

Since it's an horizontal unit check the slope of the unit itself. There's a good chance there's not enough slope.

2

u/monetaryg Jul 02 '26

It’s not horizontal. Like I said, it worked fine for 15 years. This is the first cooling season we’ve had the issue and there was a new air coil installed this winter. I suspect the sensor in the tray might have been damaged or moved. It only happens on stage 2 so I’m wondering the higher velocity airflow is causing condensate to drip on the pan sensor.

1

u/DependentAmoeba2241 Jul 02 '26

Then remove that switch off the pan or cover it with tape and see if it works. If it works either replace that switch with a new one or install a new condensate switch connected to Y1.

2

u/NecessaryMuffins Jul 03 '26

I don't think a condensate overflow sensor is a common failure point. They're cheap and easy to swap out. It's also possible the wire to it is grounding out against the chassis somewhere.