Pentair MasterTemp Heater rattling in spa mode not in pool mode

Nov 4, 2023
5
Fairfield, CT
Pool Size
15000
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
Hi all,

I'm dealing with rattling and cycling on/off of my heater. I see other posts on this that point to the thermal regulator which I'm going to check manually. The odd thing is that I only get the rattling when in spa mode, not in pool mode. I've tried lowering the spa temp set point to see if that was the issue, but alas, same rattling.

We did get some flooding prior to this occurring which took our filters for a ride, but we cleaned the filters soon after. Would greatly appreciate any guidance, thanks!

Link to video


Started June 2023, In ground Fiberglass pool (15000 gal) and spa (475 gal), Pentair 3HP Variable Speed IntelliFlo03 pump, Pentair 320 Clean and Clear cartridge filter, Pentair MasterTemp 300k BTU electronic ignition digital gas heater, Pentair IntelliCenter automation system
 
Welcome to TFP.

What pump speed and flow rate are you hearing the rattling?

Does the rattling change if you change the pump speed?

Your heater should be under warranty. It can be the thermal regulator or the internal bypass.

The thermal regulator is easy to remove and as a test run the system without the thermal regulator installed.

I would make a warranty claim and not dig into the heater to check the internal bypass.

 
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