52
Code
Description
Information
HS
Water 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 in 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 fi ring, indicating a po-
tentially damaging low water fl ow condition. Normal operation resumes when
temperatures stabilize. If this condition is detected 3 times in a one hour period,
the heater will lock-out until the electrical power is cycled off and back on.
Sb
Keypad button stuck
closed error
If one of the keypad buttons is closed (or pressed) for more than 30 s the error
code will be displayed but the control will continue to function. The error code
will be cleared when the condition is corrected.
IF
Ignition failure error
If the control exceeds the maximum number of ignition retries or recycles the
heater will shut down and go into lockout. Automatic reset is 60 minutes.
CE
Communication error
If communication between the ignition board and the display board is not estab-
lished within 3 s of power-up an error will be displayed. After communication is
established, if it is lost for 30 s, the error will be displayed. The error code will
be cleared upon a valid data exchange between boards.
LO
Limit string open error
If the limit string opens the heater shuts down and goes into lockout. Automatic
restart is 2 minutes after the error condition is corrected and the limit string
closes. See below for more detail.
EE
EEPROM ERROR
An error was detected in the ignition control circuit board.
Figure 27:
ERROR CODES
(continued)
