🏊Pool Heater

E02

Pentair · Pentair UltraTemp Heat Pump Pool Heater

Pentair Pentair UltraTemp Heat Pump Pool Heater E02 Error Fix: Coil Temperature Sensor Fault

The evaporator coil temperature thermistor has failed. This sensor monitors the coil temperature to prevent freeze-up (the coil can ice over in cool weather operation). A failed coil sensor means the heat pump cannot activate defrost mode when needed. Check sensor wiring and connector. Replace the sensor.

warning2 fixes available✨ Free fix available

Quick Answer

Error E02 on the Pentair Pentair UltraTemp Heat Pump Pool Heater means: Coil Temperature Sensor Fault. The top-ranked community fix is “Diagnose and Repair Ignition System Components” (hard difficulty, ~90 min, DIY cost: $20-$50). 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: $250-$400.

Other Pentair Models with Error E02

Pentair IntelliFlo VSF Variable Speed Pool Pump

pool_pump · 2 fixes

Pentair IntelliFlo3 VSF Variable Speed Pool Pump

pool_pump · 2 fixes

Pentair MasterTemp 400,000 BTU Gas Pool/Spa Heater

pool_heater · 2 fixes

Other Pentair Pentair UltraTemp Heat Pump Pool Heater Error Codes

Defrost Mode

2 fixes

E01

Water 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

Compressor Fault

Insufficient Water Flow

2 fixes

People Also Ask About Pentair Pentair UltraTemp Heat Pump Pool Heater Error E02

What does error code E02 mean on a Pentair Pentair UltraTemp Heat Pump Pool Heater?

Error code E02 on the Pentair Pentair UltraTemp Heat Pump Pool Heater means: Coil Temperature Sensor Fault. The evaporator coil temperature thermistor has failed. This sensor monitors the coil temperature to prevent freeze-up (the coil can ice over in cool weather operation). A failed coil sensor means the heat pump cannot activate defrost mode when needed. Check sensor wiring and connector. Replace the sensor.

How do I fix error code E02 on my Pentair Pentair UltraTemp Heat Pump Pool Heater?

The most successful fix is "Diagnose and Repair Ignition System Components" (hard difficulty, ~90 minutes). Estimated DIY cost: $20-$50. HomeMD has 2 community-ranked fixes for this error.

Is error code E02 on a Pentair Pentair UltraTemp Heat Pump Pool Heater serious?

This error is rated warning 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 E02 myself?

Yes — the top-ranked community fix ("Diagnose and Repair Ignition System Components") is rated hard difficulty and takes about 90 minutes. Tools needed: T20 Torx screwdriver, Digital multimeter, Fine sandpaper.

How much does it cost to repair Pentair Pentair UltraTemp Heat Pump Pool Heater error E02?

DIY cost: $20-$50. Professional repair typically costs $250-$400. 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), E03 (Ambient Temperature Sensor Fault), E04 (High Pressure Switch Tripped), E05 (Low Pressure Switch Tripped), and 3 more.

Which other Pentair models have the E02 error?

Error code E02 also appears on 3 other Pentair models: Pentair IntelliFlo VSF Variable Speed Pool Pump, Pentair IntelliFlo3 VSF Variable Speed Pool Pump, Pentair MasterTemp 400,000 BTU Gas Pool/Spa Heater. The fix may vary by model, so check each model's specific page for tailored repair steps.

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)
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)
E08 — Insufficient Water Flow (2 fixes)

Which other Pentair models have the E02 error?

Error code E02 also appears on 3 other Pentair models:

Pentair IntelliFlo VSF Variable Speed Pool Pump (pool pump) · 2 fixes
Pentair IntelliFlo3 VSF Variable Speed Pool Pump (pool pump) · 2 fixes
Pentair MasterTemp 400,000 BTU Gas Pool/Spa Heater (pool heater) · 2 fixes

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