Pentair UltraTemp H/C120 Serial Comm Lost

rdmzmorgan4545

New member
Apr 20, 2020
3
Overland Park, KS
EasyTouch with IntelliChlor and UltraTemp H/C120 Installation.

Firing up HeatPump for first time this year. Heatpump Turns on performs > temperature check > and then goes through 5 minute warm-up period. It appears that it is receiving heartbeat messages from EasyTouch (flashing asterick). When the compressor kicks on almost immeadiately receive the 'Serial Comm Lost' error on HeatPump and entire unit shuts down/fan stops. This process repeats if not manually disabled at HeatPump or EasyTouch. Capacitor was replaced last year under warranty.

No wiring issues are apparent and easytouch does not throw error code when going through diagnostics/self test.

Heat Pump Com - all Set to Yes on EasyTouch
Heat Pump Status - Normal on EasyTouch
Intell Address - set to 1 on UltraTemp

Control Board on Heatpump appears to be operating normally. Heat pump is less that 3 years old.

Thanks
Ron
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
17,969
Northern NJ
Welcome to TFP.

Have you called Pentair Support?

@matterpro posted today about an UltraTemp problem and the good help he got from Pentair Supoort.


Let us know if you learn anything interesting.
 

rdmzmorgan4545

New member
Apr 20, 2020
3
Overland Park, KS
Support ticket open > Warranty Service came out made no changes HP runs fine without RS485 running, but with RS485 enabled water sensing > runs fine for a couple of minutes then error is received. Per EasyTouch > Heat Pump Only enabled > no errors when going through diagnostics. Wire from HP to ET seems to be intact with no issues. Ran for 24 hours after tech came on site with no issues and no changes. Started ocurring again tonight after shutting down to clean SWG. When pump was turned back on after cleaning > Same issue as described above runs fine w/o RS485 enabled, but dies with it enabled after about 2 minutes. Will call Pentair again for more warranty work.
 

rdmzmorgan4545

New member
Apr 20, 2020
3
Overland Park, KS
Replacement IC40 hadnt been cleaned since being installed last May after original failed under warranty. Pool when being measured manullay was showing 3000PPM while SWG/ET was and only showing 2100. Water Temp 70 degrees.