Pentair ThermalFlo important safety instructions Dealer for advice. Call the factory for advice

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Problem	PossibleCause	CorrectiveAction
Remote, Pool or Spa light ON.	Low or restricted water flow through heater. Dirty	Clean entire filtering system and or replace filter
Water Pressure light ON.	or worn filters or clogged lint traps. Clogged	element. Inspect & clean pump impeller. Adjust all
Thermostat light OFF.	filter pump impeller. Improper plumbing valve	plumbing valves. Repair suction air leaks, grease
EO1 Error	settings. Suction leak allowing air into the water	pump lid o-ring. Replace filter. Wrong filter pump pipe
Unit will not run.	flow. Low water flow when switched to spa mode.	size. Automatic pool vacuum causing restriction.
	Unit is plumbed backwards. Heat exchanger	Recharge refrigerant if required.
	clogged with debris. Internal bypass valve	Call your dealer for advise. Call the factory for advise.
	damaged or clogged with debris. Refrigerant
	system malfunction.
Remote, Pool or Spa light ON.	Low or restricted water flow through heater. Dirty	Clean entire filtering system and or replace filter
Water Pressure light ON.	or worn filters or clogged lint traps. Clogged	element. Inspect & clean pump impeller. Adjust all
Thermostat light ON.	filter pump impeller. Improper plumbing valve	plumbing valves. Repair suction air leaks, grease
Unit is cycling on & off.	settings. Suction leak allowing air into the water	pump lid o-ring. Replace filter. Wrong filter pump pipe
	flow. Low water flow when switched to spa mode.	size. Automatic pool vacuum causing restriction.
	Unit is plumbed backwards. Heat exchanger	Call your dealer for advise. Call the factory for advise.
	clogged with debris. Internal bypass valve
	damaged or clogged with debris. Fan cycling.
Remote, Pool or Spa light ON.	Low water flow through heater. Dirty or worn	Clean entire filtering system and or replace filter
Water Pressure light ON.	filters or clogged lint traps. Clogged filter pump	element. Inspect & clean pump impeller. Adjust
Thermostat light ON.	impeller. Improper plumbing valve settings.	plumbing valves. Adjust water pressure switch.
Fan is not turning.		Call the factory for advice.
Unit will not start.
All control lights ON.	Compressor has not started yet. Low water flow	Wait for the 5 minute compressor time delay. Clean
Fan is turning, no cool air	through heater. Dirty or worn filters or clogged	entire filtering system and or replace filter element.
discharging out the top of heater.	lint traps. Clogged filter pump impeller. Improper	Inspect & clean pump impeller. Adjust plumbing valves.
Unit is not heating.	plumbing valve settings.	Call factory or dealer.
Spa will not heat to maximum	Low or restricted water flow through heater.	Clean entire filtering system and or replace filter
temperature of 104° F.	Dirty or worn filters or clogged lint traps. Clogged	element. Inspect & clean pump impeller. Adjust all
Thermostat is turned all the way up.	filter pump impeller. Improper plumbing valve	plumbing valves. Repair suction air leaks, grease
	settings. Suction leak allowing air into the water	pump lid o-ring. Shut off air blower and or Venturi
OR	flow. Low water flow when switched to spa mode	inlets that allow air turbulence in the spa. Use a cover
	or the control is not in spa mode. Unit is plumbed	while heating the spa. Outside air temp. too cold. Set
Spa is heating very slowly.	backwards. Heat exchanger clogged with debris.	spa pump timer for longer time. Call your dealer for
	Internal bypass valve damaged or clogged with	advice. Call the factory for advice.
	debris. Your spa thermometer is not reading the
	correct temperature. Air blower is running.
	Venturi air inlets are open. It is very cold outside.
	Spa pump is not running.
Pool is heating very slowly.	Low or restricted water flow through heater.	Clean entire filtering system and or replace filter
Pool is not getting up to temperature.	Dirty or worn filters or clogged lint traps. Clogged	element. Inspect & clean pump impeller. Adjust all
	filter pump impeller. Improper plumbing valve	plumbing valves. Repair suction air leaks, grease
	settings. Suction leak allowing air into the water	pump lid o-ring. Use a pool cover. Place a wind break
	flow. It is cold outside. Pool pump timer is not set	around pool. Set pool pump timer longer. Call your
	for a long enough running period. Pool is not	dealer for advice. Call the factory for advice.
	covered. High wind speed over pool. Shaded
	pool area.

ThermalFlo Installation and User’s Guide