Pentair Pentair UltraTemp Heat Pump Pool Heater EVAP COIL DIRTY Error Fix: Evaporator Coil Dirty/Blocked

Error code EVAP COIL DIRTY on the Pentair Pentair UltraTemp Heat Pump Pool Heater means: Evaporator Coil Dirty/Blocked. The outdoor evaporator coil is clogged with leaves, cottonwood seeds, dirt, pollen, or other airborne debris. This restricts airflow and reduces heat transfer efficiency, potentially causing high pressure (E04/HP) or low pressure (E05/LP) faults. Clean the coil with a garden hose — spray from the inside out to push debris off the coil surface. Do not use a pressure washer as it can damage the aluminum fins. Trim vegetation to maintain at least 24 inches of clearance around the heat pump.

The most successful fix is "Perform Deep Coil Cleaning and Fin Straightening" (medium difficulty, ~45 minutes). Estimated DIY cost: $10-$20. HomeMD has 2 community-ranked fixes for this error.

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

Yes — the top-ranked community fix ("Perform Deep Coil Cleaning and Fin Straightening") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Garden hose, Fin comb, Gloves, Eye protection.

DIY cost: $10-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

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.