42
ONLY USE GENUINE HAYWARD REPLACEMENT PARTS
51300803801 REV B
Table 13: Display Code Index
Code
Description
Information
AC
Air switch circuit closed error Differential Pressure Switch closed when expected open. If the switch is
closed before the blower has started, the ignition control board will not
start the blower until the circuit is opened.
A1
Air switch circuit open before
ignitor warm-up
Differential Pressure Switch open when expected closed. This code indi-
cates the switch circuit never closed when the blower turned on or re-
opened within 10 seconds of the blower starting.
A2
Air switch open after ignitor
warm-up
Differential Pressure Switch open when expected closed. This code indi-
cates the switch opened during the heating cycle.
A3
Air switch open during post-
purge
Differential Pressure Switch open when expected closed. This code indi-
cates the switch opened after the heating cycle was completed but before
the post-purge time (30 sec.) could be completed.
NOTE: Continuation of control sequence is immediate after error is corrected. Automatic
reset may take up to 2min for control self-diagnostics to complete. Lockout recover may
take up to 60 min.
b1
Ignition control board data
error
If the ignition control board does not satisfy self-diagnostic on power up or
initial trial for ignition, the ignition control board will lockout until error con-
dition is corrected.
b2
Gas valve sensed as “ON”
error
If gas valve is powered when it should be off, the heater will shut down
and go into lockout. The blower will operate until error condition is correct-
ed.
b3
Gas valve sensed as “OFF”
error
If gas valve is unpowered but flame is sensed, the blower will run for 5
seconds then start a new ignition sequence. If error occurs 10 times dur-
ing a call for heat, the ignition control board will go into lockout.
b4
Data retrieval error
If input data values are corrupted on power up or initial trial for ignition, the
ignition control board will lockout until error condition is corrected.
bo
Bypass operation mode
This is a normal display when the heater is being controlled by a remote
thermostat. No service is required. If the heater is not being controlled by
a remote thermostat, change the setting according to the instructions in
the ELECTRICAL CONNECTIONS section of the manual.
CE
Communication error
If communication between the ignition control board and the display board
is not established within 3 s of power-up or is lost for 30s during operation
unit will shut down and error will be displayed. The error code will be
cleared upon a valid data exchange between boards.
EE
EEPROM error
An error was detected in the ignition control board.