r/geothermal • u/Personal-Grocery2390 • 15d ago

Waterfurnace (Series 7) errors

As we move into spring, my waterfurnace unit seems to throw E55 errors sometimes, put itself in a timeout and then carry on fine. I think it's when it switches from heating to cooling, though not entirely sure. Is that normal?

Today it threw a "E71: SafeMode EEV2 - Loss of Charge", which I've never seen before. Power cycling seems to have made it go away ... at least for now.

We converted it to a non-pressure geo-flo flow center last year (dual variable speed pumps). Some of the information I could find online re the E55 errors implied that the flow rate might be too high? Does that make any sense - I was under the impression it dynamically adjusted the pump speed to acheive the parameters it wanted, so there's no real flow rate to set.

Loop temp in symphony is about 40F (presumably from running in heating mode)

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u/leakycoilR22 15d ago

The only time I've ever seen the (loss of charge) fault is when you have a leak. Depending on how old it is it could be in the coil. I have also done a lot of transducers recently as well. The factory welds there weren't great. And E 55 is an out of envelope code. Which means the system doesn't like how cold the loop is while running in AC it's common in transition periods nothing to worry about. But the loss of charge is concerning you should have a tech out.

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u/Personal-Grocery2390 15d ago

Wow, you have the perfect username for this one ;) Thanks. The tech looked remotely over Symphony and said pressures look OK. It's about 10 years old.

He was inclined to think it was to do with some zones running in heating and some cooling (at the same time). Surprising to me that it can't cope with that, and I think it's the first time it happened in 10 years.

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u/djhobbes 15d ago

Multiple zones can make conflicting calls simultaneously but the system cannot heat and cool at the same time. The IZ2 logic will allow the system to attempt to satisfy one call (i.e. heat) for 20 minutes, stop running, switch over to the other mode (i.e. cooling), and then run for 20 min and on and on.

E55 almost always means you were cooling with a cold loop. It’s more of a nuisance report than a legitimate service issue. I have recently had a unit with a reversing valve that was getting stuck mid seat send near infinite e55s but the age of your unit I doubt seriously that that is the issue.

I’m unclear about the e71. WF doesn’t use the EEV board anymore. There is a procedure to remove the board and update the software. If the issue persists and it turns out to be false reporting (not actually an issue) I would probably ask your service guy to call WF and ask about maybe performing the EEV board removal. Just an idea. It eliminates a board that could possibly be failing.

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u/Personal-Grocery2390 15d ago

Oooh, thank you - that's a great lead on what to do. I finally found a service tech I like, but my nature is still to want to understand how this works myself ;)

I would think it should be able to reverse every 20 mins without issue .... but I backed off the heating temp downstairs for now to see if avoiding cycling helps it.

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u/peaeyeparker 15d ago

It has nothing to do with the loop. Out of envelope e55 is the ambient space where the unit actually sits. A basement or attic or crawlspace that below or above temp. 55 on the low side and 85 on the high. It is not a loop issue.

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u/CollabSensei 15d ago

My experience is with my Climatemaster 27 that is in the process of being replaced. As the charge leaks out, the first thing that goes is stage 2. My unit right now, if it kicks to stage 2, it will fault out. If you prevent it from going to stage 2, then it working at 60% capacity. 60% capacity is better than 0%.