LP-314 Rev. 012 Rel. 003 Date 9.27.19
45
TOP TEMP SENSOR
PUMP ON F02
F02 indicates the top temperature sensor of
the tank has failed. This code indicates a serious
safety issue by the red fault light and LOCKOUT
flashing on the display. The unit will not restart
until a technician replaces the sensor and resets
the unit. During this lockout fault, the circulator
pump will be on as indicated on the second line
of the display.
1. Check the electrical connection to the thermistor on
the outlet manifold. Verify 5 VDC by checking the Molex
connector. If no 5 VDC, check harness. If harness is OK, replace
control. NOTE: Verify thermistor values by referencing chart in
this manual.
2. Replace thermistor if necessary.
BOT TEMP SENSOR
PUMP ON F03
F03 indicates the bottom temperature sensor of
the unit has failed. This code indicates a serious
safety issue by the red fault light and LOCKOUT
flashing on the display. The unit will not restart
until a technician replaces and resets the unit.
During this lockout fault, the pump will be on as
indicated on the second line of the display.
1. Check the electrical connection to the thermistor. Check
the wire harness. If harness is OK, replace control. NOTE: Verify
thermistor values by referencing chart in this manual.
2. Replace thermistor if necessary.
TOP TEMP HIGH
PUMP ON F05
F05 indicates the top temperature of the tank
is excessive. If accompanied by the illuminated
red fault light and LOCKOUT flashing on the
display, this code indicates the temperature
on the top sensor has exceeded 230
o
F and a
serious safety issue exists. The unit will not restart
until a technician repairs the cause of excessive
temperature and resets the unit.
If the red fault light is not illuminated and this
message is displayed, the top temperature of
the tank is at or above 210
o
F. The message will
clear automatically when the temperature drops
below 194
o
F. While this message or lockout fault
is displayed, the pump will be on as indicated on
the bottom line.
1. Check the electrical connection to the thermistor on the
outlet manifold. Verify 5 VDC by checking in Molex connector.
If not 5 VDC, check harness. If harness is OK, replace control.
NOTE: Verify thermistor values by referencing the resistance
table in this manual.
2. Replace thermistor if necessary.
BOT TEMP HIGH
PUMP ON F06
F06 indicates the bottom temperature of the
tank is excessive. If this code is accompanied
by the illuminated red fault light and LOCKOUT
flashing on the display, then the temperature on
the bottom sensor has exceeded 230
o
F and a
serious safety issue exists. The appliance will not
restart until a technician repairs the cause of the
excessive temperature and resets the unit.
If the red fault light is not illuminated and this
message is displayed the bottom temperature
of the tank is at or above 210
o
F. The message will
clear automatically when the temperature drops
below 194
o
F. During the time that this message or
lockout fault is displayed, the pump will be on as
indicated on the bottom line of the display.
1. Check the electrical connection to the thermistor on the
outlet manifold. Verify 5 VDC by checking in Molex connector.
If not 5 VDC, check harness. If harness is OK, replace control.
NOTE: Verify thermistor values by referencing chart in this
manual.
2. Replace thermistor if necessary.
NO FLAME ON IGN
PUMP ON F09
The unit tried to ignite four times during a call
for heat and failed all four times. F09 indicates a
serious safety issue. The unit will not restart until
a technician repairs the cause of no ignition and
resets the display. The red fault light and LOCKOUT
will flash on the display. During this lockout fault,
the pump will be on as indicated on the bottom
line.
1. Watch the igniter through the observation window.
2. If there is no spark, for natural gas units check the spark
electrode for the proper gap. Use 2 quarters together as a
gauge to check gap spacing.
3. Remove any corrosion from the spark electrode and flame
rectifier probe.
4. If there is a spark but no flame, check the gas supply to the
appliance.
5. If there is a flame, check the flame sensor.
6. Check for any flue blockage or condensate blocks.