WHL-038 Rev. 1.29.16
54
FLUE SENSOR F04
PUMP ON TIME
F04 indicates that the flue temperature
sensor of the boiler has failed. The boiler will
not restart until a technician replaces the
sensor and pushes
RESET
on the display. This
is a serious safety issue as indicated by the
illuminated red light and the word LOCKOUT
flashing on the display. During this lockout
fault, the pump will be on.
Inspect the flue sensor for physical damage or corrosion
and replace it if necessary. Check the electrical connection
to the flue sensor and repair as necessary. Measure the
resistance of the sensor and refer to the sensor resistance
table in this manual. The temperature on the chart should
be close to the temperature in the flue. If not, replace the
flue sensor.
SUPPLY HIGH F05
PUMP ON TIME
F05 indicates the boiler supply temperature
is excessive. When accompanied by the
red FAULT light and LOCKOUT flashing on
the display, this code indicates the supply
sensor temperature has exceeded 230
o
F and
a serious safety issue exists. The boiler will
not restart until a technician determines and
repairs the cause of excessive temperature
and pushes
RESET
on the display.
If the FAULT light is not illuminated and
this message is displayed, the supply
temperature of the boiler 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 fault is displayed,
the pump will be on.
1. Check circulator pump operation.
2. Ensure adequate flow through the boiler by accessing
the status menu and determining there is less than a 50°F
rise from the return thermistor to the supply thermistor.
3. Check the direction of flow off the boiler circulator. (See
Piping Details in this manual.)
4. Troubleshoot the dual supply thermistor by following
steps in F02.
RETURN TEMP HIGH F06
PUMP ON TIME
This display indicates that the boiler
return temperature is excessive. When
accompanied by the red FAULT light and
LOCKOUT flashing on the display, this code
indicates that the return sensor temperature
has exceeded 230
o
F and a serious safety
issue exists. The boiler will not restart until a
technician determines and repairs the cause
of excessive temperature and pushes
RESET
on the display.
If the red FAULT light is not illuminated and
this message is displayed, then the return
temperature of the boiler 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.
1. Check circulator pump operation.
2. Ensure adequate flow through the boiler by accessing
the status menu and determining there is less than a 50°F
rise from the return thermistor to the supply thermistor.
3. Check the direction of flow on boiler circulator. (See
Piping Details in this manual.)
4. Troubleshoot thermistor by following steps in F02.
Screen
Description
Possible Remedy
NO FLAME ON IGN F09
PUMP ON TIME
The boiler tried to ignite four times during
one heat call and failed. This is a serious
safety issue as indicated by the illuminated
red light and the word LOCKOUT flashing on
the display. The boiler will not restart until a
technician determines and repairs the cause
of ignition failure and pushes
RESET
on the
display. During this lockout fault, the pump
will remain on.
1. Watch the igniter through the observation window.
2. If there is no spark, check the spark electrode for the
proper 1/4” gap between the burner.
3. Remove any corrosion from the spark electrode.
4. If there is a spark but no flame, check the gas supply to
the boiler.
5. If there is a flame, check the flame current.
6. Check any flue blockage or condensate blocks.
7. Replace the ignitor.