Rheem pool spa heat pump fault codes F51, F52, F54, F55

by Petina
(Miramar beach, fl)

Rheem pool/spa heat pump digital Model #: M8350TI-E serial#: W151416637 started to get cold here in Florida turned heat pump on last week everything worked fine until yesterday.
Trying to heat spa only set temp for spa @ 75 degrees. Actual water temp 49 degrees. Light comes on when heater is heating water. Feel water coming out of jets warm!/ hot! Yeah! but Then after 5 minutes light goes off. Fault code pops up. I'll hit the set button on control panel heater kicks on, light on showing water being heated, feel water outta jets warm/ hot. This continues until I get tired of going outside every 10 minutes or so. What are the fault codes? How to fix? Heat pump only year old.

Comments for Rheem pool spa heat pump fault codes F51, F52, F54, F55

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Apr 18, 2018
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very helpful
by: Anonymous

This was a great help thanks

Apr 07, 2018
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Rheem m5350ti-e display
by: Anonymous

Pool heater displays r.25 when I attempt turn up heat. Heater has been off for a while it will display temperature display but when I press heat up it just says r.25 and doesn't turn on

Mar 26, 2018
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F55
by: Anonymous

Ok so what does F55 mean

Feb 27, 2018
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Heater Fault Code
by: Shorerider

As mentioned in the comment Jan 2016, your error codes are FS1, FS2, FS4, FS5 not 51, 52 etc. It means your unit is in defrost cycle, after the 5th cycle (FS5) the compressor will shut off to prevent internal damage. This is caused by your cold ambient outdoor temperature. When your unit kicks on, the air passing over the coil is 20 degrees colder than the ambient outdoor temp. If the outdoor temp is below 52 degrees then the air over the coil is below 32 degrees, hence defrost cycle. Run your Heat Pump only when the day/night temps are closer to 60 degrees.

Jan 03, 2018
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Heater codef51
by: Terrynymous

Pool heater code f51 how do I fix

Jun 02, 2017
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Sensor control
by: Chevalier John

Sensor control not working gets to high

Jan 15, 2017
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Jan 24, 2016
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FS not F5
by: Anonymous

Unit is in the defrosting cycle which means that the fan is operating but the compressor has been stopped.
A numerical digit behind the FS indicates how many times the unit has switched into this mode

Dec 30, 2015
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Same here
by: In Phoenix

Model M8350TI-E
Seems to start ok on either pool or spa setting and red heating light on. Then after a few minutes, the heating (red) light goes out and I get either F51, F52, F54, F55 code show up? Tried everything I can think of.

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