I JUST FINISHED INSTALLING MY NEW POOL HEATER , WHEN I TURNED IT ON IT SEEMED TO BE FINE THE TEMP READ 62 DEGREES AND IT RAN FOR 5 MINUTES THEN AN ERROR CODE CAME UP LP ( LOW PRESSURE ) , AS IT WAS ON THE TEMP NEVER WENT UP AND THEN IT SHUT OFF WITH THE LP CODE ? THIS UNIT IS BRAND NEW ANY IDEAS ?
NEW HAYWARD HP 21404T POOL HEATER ERROR CODE LP
- Thread starter alandavid
- Start date
- Jun 22, 2014
- 47,854
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
Welcome to TFP! 
I'm no heater expert, but I first need to ask, what is your current water temp? Many heaters sense if the water is too cold and/or are not designed to operate in very cold water. Stand by for more replies.
I'm no heater expert, but I first need to ask, what is your current water temp? Many heaters sense if the water is too cold and/or are not designed to operate in very cold water. Stand by for more replies.LP = Low pressure switch circuit open.
Causes = Air flow obstruction - Remove debris, etc. restricting air flow to heat exchanger OR
Low ambient temperature cutoff - Wait for outside temperature to reach 60°F OR
Unit low on refrigerant - Call for service.
Page 25 of the manual.
Causes = Air flow obstruction - Remove debris, etc. restricting air flow to heat exchanger OR
Low ambient temperature cutoff - Wait for outside temperature to reach 60°F OR
Unit low on refrigerant - Call for service.
Page 25 of the manual.
