🏊Pool Heater

E04

Zodiac · JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls

Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls E04 Error Fix: Condenser Temperature Sensor Fault

The condenser temperature sensor is providing faulty readings or is disconnected. This impairs heat pump operation by causing improper cycle control and potential overheating.

Medium severity2 fixes available✨ Free fix available

Quick Answer

Error E04 on the Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls means: Condenser Temperature Sensor Fault. The top-ranked community fix is “Replace Condenser Temperature Sensor” (medium difficulty, ~40 min, DIY cost: $40-$60). 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.

Root Cause Analysis

Sensor MalfunctionPrimary

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: $120-$180.

Other Zodiac Models with Error E04

CNX 30 iQ Robotic

pool_cleaner · 2 fixes

Ei2 Salt Chlorinator with 25,000 Gallon Capacity and Self-Cleaning Electrolytic Cell

salt_chlorinator · 2 fixes

MX6 18 ft Advanced Suction Pool Cleaner with Cyclonic Vacuum Technology

pool_cleaner · 2 fixes

MX8 Elite Suction

pool_cleaner · 2 fixes

Other Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls Error Codes

E01

High Pressure Switch Fault

2 fixes

E02

Low Pressure Switch Fault

2 fixes

E03

Evaporator Temperature Sensor Fault

2 fixes

E05

Water Flow Sensor Fault

2 fixes

E06

Compressor Overload Fault

Defrost Sensor Fault

Fan Motor Lock Fault

Heater Element Fault

People Also Ask About Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls Error E04

What does error code E04 mean on a Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls?

Error code E04 on the Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls means: Condenser Temperature Sensor Fault. The condenser temperature sensor is providing faulty readings or is disconnected. This impairs heat pump operation by causing improper cycle control and potential overheating.

How do I fix error code E04 on my Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls?

The most successful fix is "Replace Condenser Temperature Sensor" (medium difficulty, ~40 minutes). Estimated DIY cost: $40-$60. HomeMD has 2 community-ranked fixes for this error.

Is error code E04 on a Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls serious?

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Can I fix Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls error E04 myself?

Yes — the top-ranked community fix ("Replace Condenser Temperature Sensor") is rated medium difficulty and takes about 40 minutes. Tools needed: Screwdriver, Multimeter.

How much does it cost to repair Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls error E04?

DIY cost: $40-$60. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

What other error codes does the Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls have?

The Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls has 8 other known error codes, including: E01 (High Pressure Switch Fault), E02 (Low Pressure Switch Fault), E03 (Evaporator Temperature Sensor Fault), E05 (Water Flow Sensor Fault), E06 (Compressor Overload Fault), and 3 more.

Which other Zodiac models have the E04 error?

Error code E04 also appears on 4 other Zodiac models: CNX 30 iQ Robotic, Ei2 Salt Chlorinator with 25,000 Gallon Capacity and Self-Cleaning Electrolytic Cell, MX6 18 ft Advanced Suction Pool Cleaner with Cyclonic Vacuum Technology, MX8 Elite Suction. The fix may vary by model, so check each model's specific page for tailored repair steps.

What other error codes does the Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls have?

The Zodiac JE2500T 250,000 BTU Titanium Heat Exchanger Pool Heater with Digital Controls has 8 other known error codes:

E01 — High Pressure Switch Fault (2 fixes)
E02 — Low Pressure Switch Fault (2 fixes)
E03 — Evaporator Temperature Sensor Fault (2 fixes)
E05 — Water Flow Sensor Fault (2 fixes)
E06 — Compressor Overload Fault (2 fixes)
E07 — Defrost Sensor Fault (2 fixes)
E08 — Fan Motor Lock Fault (2 fixes)
E09 — Heater Element Fault (2 fixes)

Which other Zodiac models have the E04 error?

Error code E04 also appears on 4 other Zodiac models:

CNX 30 iQ Robotic (pool cleaner) · 2 fixes
Ei2 Salt Chlorinator with 25,000 Gallon Capacity and Self-Cleaning Electrolytic Cell (salt chlorinator) · 2 fixes
MX6 18 ft Advanced Suction Pool Cleaner with Cyclonic Vacuum Technology (pool cleaner) · 2 fixes
MX8 Elite Suction (pool cleaner) · 2 fixes

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