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1/22/2020 12:12:56 PM
Posted: 9/19/2009 3:30:54 PM EST
[Last Edit: 9/20/2009 6:39:32 AM EST by CITADELGRAD87]
I think I have a bad temp sensor/probe. It says "HI" in the display, manual says that means water is 114+, it is NOT and has never been that hot. Cycling the power at the breaker does not reset it . Looks like a simple probe swap, but the guy at the pool store said there are also two high temp switches to protect against overheating. The parts are about $44 each, anyone have any experience/ideas, I'd rather not buy all 3 parts, they are special order items.

Link Posted: 9/20/2009 7:29:30 AM EST
[Last Edit: 9/20/2009 7:47:01 AM EST by MrHold]
could be a flow problem as a poolman the first thing do is clear all baskets & backwash or clean filter is this your heaterhttp://www.pentairpool.com/pdfs/MiniMaxNTHeater-DDTC-IG.pdf

if it is I would think it is temp probe figure 5 P9 in RED on drawing

I would also check water chemistry you could be eating up your heater causing probe failure

Link Posted: 9/20/2009 6:38:04 PM EST
Baskeets emptied weekly, backflushed last weekend.

Water parameters monitored weekly. Heater is about 4-5 years old, last week it worked, this week it claims "HI", and will not cycle.
I think it's either the "thermistor probe" of one of two "sensor high limits"

That link is my heater.
Link Posted: 9/20/2009 6:44:10 PM EST
Link Posted: 9/20/2009 8:33:17 PM EST
Originally Posted By Wolfpack:
Pool guy since 1991 here. Heaters can be compared to cars, if they aren't started once in a while they fall apart. If the filter is clean you have a sensor problem, they go out all the time.

THanks, that;'s what I figured, but I don't know which sensor fo the three to replace?
I run it once a month all year, every weekend during summer.
Any idea which of hte three probes is bad? They are $45 each, I'd rather not blow $100 extra than I need to.
Link Posted: 9/20/2009 9:50:07 PM EST
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