Hayward ED2 - HF Flame Present with Gas Valve Closed; Heater Flame Sensing Fault

Heater System Solving Guide
FAULT CODE THUMBNAILS – PAGE F 8
FAULT CODE THUMBNAILS – PAGE F 8
Heater System Solving Guide
Fault Code Thumbnails HF NEW: Gas Valve Fault or OLD: Heater Flame Sensing Fault
FAULT CODE THUMBNAILS HF FLAME PRESENT WITH GAS VALVE CLOSED / HEATER FLAME SENSING FAULT
UHS
IDL2
ED2
IDL
HF
HEATER FLAME SENSING FAULT
IDL, ED2
PARTS THAT MAY BE NEEDED
• Ignitor / Flame Sensor
• Control Module / Ignition Board
DIAGNOSTIC SEQUENCE
A. Check all wiring and connections for Flame sensor.
B. Replace flame sensor (IDL) or ignitor (ED2).
C. Replace control module/ignition board if problem still exists.
HF
FLAME PRESENT WITH GAS VALVE CLOSED
UHS, IDL2
PARTS THAT MAY BE NEEDED
• Gas Valve
If flame is sensed without the gas valve energized, the control will go
into lockout.
DIAGNOSTIC SEQUENCE
• SHUT OFF GAS TO HEATER IMMEDIATELY.
• The gas valve is defective and needs to be replaced.
RIGHT: HF INDICATES A FLAME SENSING FAULT ON OLDER MODELS (IDL, ED2)
BELOW: HF INDICATES A GAS VALVE FAULT ON NEWER MODELS (UHS, IDL2)