Ever taken a dip in a pool so cozy it felt like the water was hugging you? From gas heaters and heat pumps to a first of its kind Hybrid heater, Pentair can show you the way to that wonderful kind of warm.

Pool Heaters Troubleshooting

The pressure switch sensing water flow is open. 
1. Water circulation pump not on. 
2. Insufficient water flow. 
3. External bypass open. 
4. Bad water pressure switch. 
Verify water circulation pump is on. Dirty or worn filters or clogged lint traps. Verify filter is clean, backwash if necessary to clean entire filter system or replace filter element if needed. Inspect & clean pump impeller. Adjust Plumbing valves. Repair suction air leaks. Make sure external water bypass around heat pump is closed.  With water flowing, check resistance of water pressure switch, if open, replace switch. 

The 24 VAC supply voltage to the control board is low.  
1. Bad transformer 
2. Insufficient supply voltage to the heat pump. 
Supply voltage to the transformer should be between 208 and 260 volts. Transformer should output between 24 and 28 volts. If below this range, replace transformer. Check supply voltage to the heat pump. Supply voltage should be between 208 and 260 volts. Check to see if a phase is out. Should have 120 volts to ground and 240 volts across power legs. 

Refrigerant high pressure switch is open. 
1. Water circulation pump not on. Verify water pump is on. 
2. Insufficient water flow. 
3. External bypass open. 
4. Bad refrigerant high pressure switch. Check resistance of switch, if open, replace switch. 
5. TXV Stuck Closed 
6. Low or restricted water flow through heater. Dirty or worn filters or clogged lint traps. Clogged filter pump impeller. Improper plumbing valve settings. Suction leak allowing air into the water flow. Low water flow when switched. 
7. Unit overcharged. 
Verify water pump is on. Verify filter and skimmers are clean, backwash if necessary. Minimum flow 30 GPM. Verify external water bypass around heat pump is closed. Also make sure all other valves are open or in the proper positions to allow proper water flow through heat pump. 

Refrigerant low pressure switch is open. 
1. Low refrigerant in system. Find source of refrigerant leak and fix. Pull vacuum and recharge. 
2. Air and water temperatures too cold to operate the heat pump. 
3. Bad refrigerant low pressure switch. Check resistance of switch with a full charge, if open, replace switch. 
4. Faulty fan blade. 
5. TXV Stuck Closed. 
Check the capacitor and fan motor. Replace either one if it is faulty. Check the fan blade and make sure it is not slipping or broken. If so, replace the fan. 

Unit is forming ICE or Frost on the outer air coil, usually at the bottom. 
The outside air temperature too low and Defrost feature is NOT enable. Malfunctioning Defrost Thermistor. Make sure heater is installed with the required placement clearances for air flow and roof clearance. Do NOT install indoors. Make sure that your sprinklers DONOT spray on the heater in any way what so ever. If ice forms on the outer coil, shut the heater off and allow ice to thaw. You may use water at low pressure to thaw ice build up on the outer coil, shut the heater off when doing so. Call your dealer or factory for advice corrective action does not solve the problem. 

Pool is heating very slowly. Pool is not getting up to temperature. 
Low or restricted water flow through heater. Dirty or worn filters or clogged lint traps. Clogged filter pump impeller. Improper plumbing valve settings. Suction leak allowing air into the water flow. It is cold outside. Pool pump timer is not set for a long enough running period. Pool is not covered. High wind speed over pool. Shaded pool area. Clean entire filtering system and or replace filter element. Inspect & clean pump impeller. Adjust all plumbing valves. Repair suction air leaks, grease pump lid O-ring. Use a pool cover. Place a wind break around pool. Set pool pump timer longer. Call your dealer for advice. Call the factory for advice.