Pentair Pentair UltraTemp Heat Pump Pool Heater LP Error Fix: Low Pressure

Low-side refrigerant pressure switch is open. Same condition as E05 — refrigerant pressure too low. Check for leaks, low ambient temperature, and coil condition.

critical2 fixes available✨ Free fix available

Quick Answer

Error LP on the Pentair Pentair UltraTemp Heat Pump Pool Heater means: Low Pressure. The top-ranked community fix is “Test and Repair Refrigerant Leaks and Replace Low-Pressure Switch” (hard difficulty, ~90 min, DIY cost: $10-$20). 2 community-ranked fixes available below.

Published February 2026 · 2 fixes · pool heater

Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.

When to Call a Professional

While many pool heater repairs can be done safely at home, consider hiring a qualified technician if:

The repair involves electrical wiring, gas lines, or refrigerant
You've tried the top-ranked fix and the error persists
You smell gas, see sparking, or notice water leaking
The repair requires specialized tools you don't have
Your appliance is still under manufacturer warranty

Average professional repair cost for this issue: $300-$450.

Other Pentair Pentair UltraTemp Heat Pump Pool Heater Error Codes

Defrost Mode

2 fixes

E01

Water Temperature Sensor Fault

2 fixes

E02

Coil Temperature Sensor Fault

2 fixes

E03

Ambient Temperature Sensor Fault

2 fixes

E04

High Pressure Switch Tripped

2 fixes

E05

Low Pressure Switch Tripped

2 fixes

E06

Compressor Discharge Temperature

2 fixes

E07

Compressor Fault

2 fixes

People Also Ask About Pentair Pentair UltraTemp Heat Pump Pool Heater Error LP

What does error code LP mean on a Pentair Pentair UltraTemp Heat Pump Pool Heater?

Error code LP on the Pentair Pentair UltraTemp Heat Pump Pool Heater means: Low Pressure. Low-side refrigerant pressure switch is open. Same condition as E05 — refrigerant pressure too low. Check for leaks, low ambient temperature, and coil condition.

How do I fix error code LP on my Pentair Pentair UltraTemp Heat Pump Pool Heater?

The most successful fix is "Test and Repair Refrigerant Leaks and Replace Low-Pressure Switch" (hard difficulty, ~90 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

Is error code LP on a Pentair Pentair UltraTemp Heat Pump Pool Heater serious?

This error is rated critical severity. It is generally not urgent and can often be resolved with a simple DIY fix.

Can I fix Pentair Pentair UltraTemp Heat Pump Pool Heater error LP myself?

Yes — the top-ranked community fix ("Test and Repair Refrigerant Leaks and Replace Low-Pressure Switch") is rated hard difficulty and takes about 90 minutes. Tools needed: Refrigerant leak detector, Vacuum pump, Manifold gauge set, Brazing torch, Multimeter, Adjustable wrench.

How much does it cost to repair Pentair Pentair UltraTemp Heat Pump Pool Heater error LP?

DIY cost: $10-$20. Professional repair typically costs $300-$450. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Pentair Pentair UltraTemp Heat Pump Pool Heater have?

The Pentair Pentair UltraTemp Heat Pump Pool Heater has 8 other known error codes, including: dF (Defrost Mode), E01 (Water Temperature Sensor Fault), E02 (Coil Temperature Sensor Fault), E03 (Ambient Temperature Sensor Fault), E04 (High Pressure Switch Tripped), and 3 more.

What other error codes does the Pentair Pentair UltraTemp Heat Pump Pool Heater have?

The Pentair Pentair UltraTemp Heat Pump Pool Heater has 8 other known error codes:

dF — Defrost Mode (2 fixes)
E01 — Water Temperature Sensor Fault (2 fixes)
E02 — Coil Temperature Sensor Fault (2 fixes)
E03 — Ambient Temperature Sensor Fault (2 fixes)
E04 — High Pressure Switch Tripped (2 fixes)
E05 — Low Pressure Switch Tripped (2 fixes)
E06 — Compressor Discharge Temperature (2 fixes)
E07 — Compressor Fault (2 fixes)

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