LP-517 Rev. 000 Rel. 019 Date 7.21.20
51
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 210
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 199
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.
FLAME LOSS F10
PUMP ON TIME
The flame was lost 3 times while the
boiler was firing during 1 demand
call. 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 flame loss and pushes
RESET
on the display. During this lockout fault,
the pump will be on.
1. Monitor gas pressure to the unit while in operation.
2. Assure the flame is stable when lit.
3. Check if the display readout changes from “GAS VALVE ON” to
“RUN” within a few seconds of boiler ignition.
4. Check the FLAME signal on the display. It should be above 2.5uA
when the boiler is firing.
5. If the signal reads less than 2.5uA, clean the spark probe.
6. If the problem persists and the ‘FLAME” signal is still less than
2.5uA, replace the spark igniter probe.
7. The flame signal should be steady after the boiler has been firing
for 1 minute and is normally at 5.0 to 9.0. If the flame signal is not
steady, disassemble the burner door and check the burner and its
sealing gaskets.
FALSE FLAME SIG F11
PUMP ON TIME
There is flame when the control is
not telling the boiler to run. 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 and
pushes
RESET
on the display. During
this lockout fault, the pump will be on.
1. Look into window. If there is flame, turn the gas off to the unit at
the service valve and replace the gas valve.
2. If the flame signal on the status menu is greater than 2.5uA when
the burner is not lit, replace the spark ignitor.
3. If the flame signal is not present after turning off the gas supply,
check the gas valve electrical connection.
4. Check for condensate backup. Repair condensate system as
necessary. If condensate has partially filled the combustion chamber,
the refractory wall may be damaged and should be replaced.
5. Turn the gas on at the service valve after corrective action is taken.
6. If the refractory wall falls against the spark ignitor, it may conduct
the signal to ground, giving a false reading.