Below is a list of all Diagnostic Codes for the UHS Heater. Troubleshooting Steps for
each Code are covered on the following pages.
Diagnostic
Code
Description
AC
Blower Vacuum Switch closed
AO
Blower Vacuum Switch open
BD
Bad board or secondary high voltage fault
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
19
Diagnostic Codes
Содержание H150FDN
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