Hayward HC Series User Manual

Below is a list of all Diagnostic Codes for the HDF Heater. Troubleshooting Steps
for each Code are covered on the following pages.
28
Diagnostic Codes
Diagnostic
Code
Description
AC Blower Vacuum Switch closed
A1 Air switch circuit open before ignitor warm-up
A2 Air switch circuit open after ignitor warm-up
A3 Air switch circuit open after post purge
b1 Ignition control board data error
b2 Gas valve sensed "ON" error
b3 Gas valve sensed "OFF" error
b4 Data retrieval error
bo Bypass operation mode
CE Communication Error Between Control Module and Display Interface Assembly
EE Bad board
HF Flame present with Gas Valve not energized.
HS
Maximum return water temperature exceeded and / or rapid water temperature rise.
IF Ignition Failure
IO Ignitor Circuit Open
LO Water Pressure Switch, Vent Pressure Switch, or Temperature Limit Switch Fault
PF Voltage polarity reversed, low voltage detected
SB Keypad failure
SF Temperature Sensor (thermistor) input failure

Hayward HC Series Specifications

General

Brand	Hayward
Model	HC Series
Category	Heater
Language	English