lp-666 Rev. 003 Rel. 001 Date 2.25.20
69
Code
Message
Description
Possible Remedy
F13
Lockout: F13
Fan Speed
Low
The fan is not running at the speed determined
by the control. Fan speed has been more than
30% slower than the commanded speed for
more than 10 seconds. This is a serious safety
issue as indicated by the red center pane of
the Home screen and the displayed phrase
Lockout: F13 Fan Speed Low. This 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. Check the combustion fan wiring.
2. Measure DC voltage from the red fan wire (POS) to the light blue
wire (ground) while it is connected to the fan. It should be 24V
+/- 1v volts. If it is lower than 23 volts, check for excessive external
loads connected to the boiler sensor terminals
3. Disconnect the 5 pin plug from the fan and check the voltage
on the red wire again. If it is now 24 volts, replace the fan. If it is still
below 23 volts replace the boiler control board.
F14
Lockout: F14
Fan Speed
High
The fan is not running at the speed determined
by the control. Fan speed has been more than
30% faster than the commanded speed for
more than 10 seconds. This is a serious safety
issue as indicated by the red center pane of
the Home screen and the displayed phrase
Lockout: F14 Fan Speed High. This 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. Check the combustion fan wiring.
2. Measure DC voltage from the red fan wire (POS) to the light blue
wire (ground) while it is connected to the fan. It should be 24V
+/- 1v volts. If it is lower than 23 volts, check for excessive external
loads connected to the boiler sensor terminals
3. Disconnect the 5 pin plug from the fan and check the voltage
on the red wire again. If it is now 24 volts, replace the fan. If it is still
below 23 volts replace the boiler control board.
F20
Lockout: F20
Water Level 1
(Condensate)
The condensate trap is full. This is a serious
safety issue as indicated by the red center
pane of the Home screen and the phrase
Lockout: F20 Water Level 1. 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 off.
1. Check condensate lines for obstructions.
2. Check float switch in condensate reservoir.
3. Check wiring from condensate reservoir to 928 control and
repair as necessary.
F21
Lockout: F21
Water Level 2
(Internal
LWCO Fault)
This fault indicates the water level in the
boiler is low. This is a serious safety issue as
indicated by the red center pane of the Home
screen and the displayed phrase Lockout: F21
Water Level 2.
To test LWCO function, enter the Service
Mode. If the LWCO is Ready, tap Test. Tap Reset
to clear the code.
1. Check boiler feed water system to be sure it is supplying make-
up water to the boiler system.
2. Ensure all air is bled from the system.
3. Check for leaks in the boiler and system piping and repair as
necessary.
4. Inspect low water cutoff probe and wiring for damage and
repair and replace as necessary.
F22
Lockout:
F22 External
LWCO
(EXT LWCO
Fault)
This code is generated when the External Low
Water Cutoff is installed and the water level
in the boiler is low. This is a serious safety
issue as indicated by the red center pane
of the Home screen and the displayed phrase
Lockout: F22 External LWCO.
When this code is displayed, the boiler will not
respond to a demand for heat. The pump icons
on the lower left corner of the display indicate
the status of the pumps. The pump will remain
on when this code is displayed.
IF EXT LWCO is installed:
1. Check boiler feed water system. Ensure it is supplying make-up
water to the boiler system.
2. Be sure all air is bled from the system.
3. Check for leaks in the boiler and system piping and repair as
necessary.
4. Inspect low water cutoff wiring for damage and repair as
necessary.
5. Ensure EXT LWCO has power applied to the power input
terminals.
6. Press Reset button on LWCO. If code reoccurs, replace EXT LWCO.
IF EXT LWCO is NOT installed:
Inspect the jumper from terminals 20 and 21 on the Field
Connection Board for damage or loose connections.