43
ONLY USE GENUINE HAYWARD REPLACEMENT PARTS
51300803801 REV B
Table 13: Display Code Index
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.
Code
Description
Information
HF
High flame sensor signal
error
If flame is sensed with the gas valve off the ignition control board will go
into lockout. The blower will run until error condition is corrected. When
corrected, the ignition control board will run blower for 5 s then automati-
cally restart after 2 minutes.
HS
High temperature sensing
error
A) Inlet water temperature sensor is reporting a temperature in excess of
104°F. Normal operation resumes 2 minutes after inlet water temperature
sensor reports temperatures of 104°F or less. This error functions for both
normal and remote thermostat modes.
or
B) Inlet water temperature sensor is reporting a temperature change at a
rate faster than 6°F in 60 seconds or less while the heater is firing, indicat-
ing a potentially damaging low water flow condition. Normal operation
resumes when temperatures stabilize. If this condition is detected 3 times
in a one hour period, the heater will lockout.
IF
Ignition failure error
If the maximum number of ignition retries is exceeded, the heater will shut
down and go into lockout. Automatic reset is 60 minutes.
IO
Igniter open error
If the ignition control board is not in lockout and senses that the igniter
circuit is open when the blower is running the ignition control board will
turn off the blower and go into lockout. Automatic restart 2 min after error
is corrected.
LO
Limit string open error
If the limit string opens the heater shuts down and goes into lockout. Auto-
matic restart is 2 minutes after the error condition is corrected and the limit
string closes.
PF
Electrical power supply wir-
ing error
This code will display if supply power polarity is reversed, low voltage is
detected, or if the ground path is not sufficient. Reset is immediate after
error is corrected.
Sb
Keypad stuck button error If one of the keypad buttons is closed (or pressed) for more than 30 s the
unit will shut down. The error code will be cleared when the condition is
corrected.
SF
Temperature sensor failure
error
If an excessive temperature difference between the redundant thermistors
(5 °F or more) or a sensor “out of bounds” condition with either thermistor
(less than 10°F or greater than180°F) will result in unit shut down and the
error code displayed. Automatic restart is 2 minutes after the error is cor-
rected.