lp-666 Rev. 003 Rel. 001 Date 2.25.20
68
Code Message
Description Possible Remedy
F06
Blocking:
Return
Temperature
High
OR
Lockout:
F06 Return
Maximum
This display indicates that the boiler return
temperature is excessive. This code indicates
that the return sensor temperature has
exceeded 210
o
F and a serious safety issue
exists when accompanied by the red center
pane of the Home screen and displayed phrase
Lockout: F06 Return Maximum. The boiler will
not restart until a technician determines and
repairs the cause of excessive temperature
and pushes RESET on the display.
If the center pane of the Home screen is orange
and the word Blocking is displayed, the supply
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 ow 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 ow on boiler circulator. (See Piping
Details in this manual.)
4. Troubleshoot thermistor by following steps in F02.
F09
Lockout: F09
No Ignition
The boiler tried to ignite four times during
one heat call and failed. This is a serious
safety issue as indicated by the red center pane
of the Home screen and the displayed phrase
Lockout: F09 No Ignition. The boiler will reset
automatically after an hour. The boiler may
also be restarted after 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 ame, check the gas supply to the boiler.
5. If there is a ame, check the ame current.
6. Check any ue blockage or condensate blocks.
7. Replace the ignitor.
F10
Lockout: F10
Flame Fault
The ame was lost 3 times while the boiler
was ring during one (1) demand call. This
is a serious safety issue as indicated by the
red center pane of the Home screen and the
displayed phrase Lockout: F10 Flame Fault.
The boiler will reset automatically after an
hour. The boiler may also be restarted after a
technician determines and repairs the cause
of ignition failure 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 ame 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 1.2uA
when the boiler is ring.
5. If the signal reads less than 1.2uA, 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 ame signal should be steady after the boiler has been
ring for 1 minute and is normally at 5.0 to 9.0. If the ame signal
is not steady, disassemble the burner door and check the burner
and its sealing gaskets.
F11
Lockout: F11
Flame Signal
in Standby/
Purge
There is ame during a call for heat, but prior
to the ignition sequence. This is a serious
safety issue as indicated by the red center
pane of the Home screen and the displayed
phrase Lockout: F11 Flame Signal in Standby/
Purge. 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 ame, turn the gas o to the unit at
the service valve and replace the gas valve.
2. If the ame signal on the status menu is greater than 1.2uA
when the burner is not lit, replace the spark ignitor.
3. If the ame signal is not present after turning o the gas supply,
check the gas valve electrical connection.
4. Check for condensate backup. Repair condensate system
as necessary. If condensate has partially lled 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.
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