r/geothermal

I have a 5 series that has operated well until yesterday.
Tech has diagnosed failure of both pumps. Is this a frequent failure mode?
Don't yet have the estimate for repair....needless to say I didn't buy the extended warranty.

Hi everyone,
I’m troubleshooting an AHU that isn’t achieving its design cooling performance, and I’d appreciate any suggestions.
Current operating conditions:
Chilled water inlet temperature: **8°C**
Chilled water outlet temperature: **20°C**
Fresh air temperature: **22°C**
Off-coil air temperature: **17°C** (consistently)
Coil water flow: **15.8 m³/h**
Design off-coil temperature: **9.5°C**
We’ve already:
Cleaned the strainer.
Flushed the cooling coil.
However, the off-coil temperature remains around **17°C**.
Because of this, the supply air temperature stays high, and the space temperature remains above **22°C**, whereas the design space temperature should be below **19°C**.
Has anyone experienced a similar issue? What could be causing the coil to underperform despite the available chilled water flow? Could this be related to coil performance, air bypass, balancing, control valve issues, incorrect flow measurement, or something else?
Any troubleshooting suggestions would be greatly appreciated.

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

The company, Eavor, is pivoting from project operator to "technology provider" and actively searching for an outside candidate to take over, drill the remaining loops, and run the first-of-a-kind German facility.

I am working on a 3 ton bosch geo with a QT non pressurized flow center.

Last week I was called to replace the pump on the flow center as it had failed. I did, and sent the unit off to run fine for a few days when it tripped on high head pressure again. Okay I did not fill the flow center back up with enough water to get all the air out. My fault , I add water per the instructions on the flow center and get it where I think it needs to be. 3 days later, trips on high head again.

Upon arrival this last time, system had been off for a few hours. I start it up, EWT 90, leaving temp 98. Entering water temp will creep up slowly after about an hour of running, EWT approaches 115 degrees. My refrigerant pressures and temps line up with what I would expect. 45 degree evap coil. Discharge pressure matching relatively close to EWT. starting out about 320 psi, jumping to 450 by the time it gets to 115 water temp. 15 superheat and 14 subcool if that info is relevant, 15-20 degree temp split across coil. 78 in 60 out. I dont have the right tool to check loop pressure but im not sure its relevant on a non pressurized flow center.

I'm not sure if I have air in the loop, if its possible its air locked. I dont have much information on the loop as the homeowner wasnt home, but I think they are drilled vertical loops. Are those usually installed in series? is it possible the loop is short circuiting, I wouldn't expect my loop temperature to rise so fast in just an hour. I can shut the unit off. wait 15 minutes, and the water temp will be around 105 degrees if I just run the pump without the compressor,

Any insight on this is appreciated. I live in Southern Illinois Missouri area. temps warm the last few weeks but only going to get warmer.

Most people haven't heard of Fervo Energy. That might be about to change.

Quick background: they IPO'd on Nasdaq in May 2026 at $27 — stock jumped 33% day one. They build Enhanced Geothermal Systems (EGS) — basically forcing hot water through rock where there's no natural reservoir. Cape Station in Utah is the first commercial-scale EGS plant in the world.

Why this matters right now:

Google signed a framework agreement for up to 3 GW of geothermal by 2033. That's not a typo — 3 gigawatts. For context, their original PPA with Fervo was 115 MW. This is a 26x expansion in committed interest.

AI data centers need 24/7 firm power, not intermittent solar/wind. Geothermal delivers exactly that.

The bull case numbers:

- 658 MW in binding PPAs = $7.2B in contracted future revenue

- Cape Station Phase I (~100 MW) commissioning underway → Q4 2026 commercial operation

- Analysts: Buy consensus, average PT $45.73 vs current ~$35

- Baird: $50 PT (Outperform). Barclays: $48 (Overweight)

The bear case:

- Still pre-revenue. Q1 2026 net loss: $31.8M

- CAPEX through Q1 2027: ~$1.2B. Any Cape Station delay reprices this from a $9.5B market cap with near-zero revenue

- The Google 3 GW is a framework, not a signed construction contract

This is a high-risk, 5–7 year hold. Not a trade.

Happy to share the full breakdown — anyone else watching the AI energy infrastructure space?

Has anyone ever installed a swimming pool over their ground loop field either completely or just partially? I am told this could void the warranty of the loop field and possibly make efficiency worse. I am wondering if anyone has ever actually done it?

I had a catastrophic housefire May 31, the house was a total loss but I believe the geothermal loop is still good (the heat pump has water damage from firefighting efforts obviously). How would I go about preserving the geothermal loops and connection points for when I rebuild?

Seems that Dandelion is abandoning its customers in Long Island. They will no longer manage/maintain equipment, they installed. While a tough nut to swallow, my issue is with Entertech. Do people have an issue getting parts? Is their supply chain so bad, that it takes two weeks to get a sensor?