80
Fault Code LOU
24 VOLT LOW LOU
PUMP ON
This display indicates that the 24 volt power supply
on the control is damaged or overloaded. This code
resets automatically if it is the result of an overload
and that overload condition is removed. The second
line indicates the status of the pump. Note that while
24 volt power is low, the pump output will be on.
1. Check line voltage. It must be between 100 and
128 volts.
2. If available, connect PC, and using HTP service
software check the 24v supply display in the lower left
corner of the screen. The number displayed here
must be greater than 128 and should be no greater
than 250. Use this as a troubleshooting guide as you
follow the steps below.
3. Remove the 10 pin Molex connector from customer
connection board. If the message clears, then the
problem is with the external sensor wiring. Examine
the external sensor wiring for shorts to the ground,
repairing as necessary. If the message is still present
and the boiler is so equipped, disconnect the UL 353
low water cut-off to see if the message clears.
Replace the faulty part. Check the low voltage wire
harness in boiler for shorts to ground.
4. If a message only occurs when the burner tries to
light, check the gas valve for excessive current draw.
5. If a message is present with the low voltage
harness disconnected from the 926 control board,
replace the 926 control board.
Fault Code F00
WATER HIGH TEMP F00
PUMP ON
This display indicates if the water in the boiler has
overheated. This code indicates a serious safety
issue and the boiler will not restart until it cools
sufficiently and a technician repairs the cause of
overheating and pushes the RESET button on the
display. This is a serious situation and is indicated
by the red light on the display illuminating and the
word LOCKOUT flashing on the display. During this
lockout fault, the pump will be on as indicated on the
second line in an effort to cool the boiler down.
1. Check circulator pump operation
2. If the circulator pump is running, be sure that there
is water in the system and that the water is moving
through the system as intended. Be sure that all
correct ball valves and or zone valves are open or
closed as intended.
3. Observe the temperature/pressure gauge. If the
water is not too hot and this message is displayed,
check the wiring to the water ECO sensor and repair if
necessary. If the wiring is ok and this code is still
present and the water is not excessively hot, replace
the ECO sensor.
Fault Code F01
FLUE TEMP/WAT LV F01
PUMP ON
This display indicates that the flue temperature limit
switch of the boiler has tripped or that the water level
in the boiler is low (this will only occur if the optional
UL353 LWCO is installed). This code indicates a
serious safety issue. The boiler will not restart until
the flue cools down sufficiently or the water level is
restored. A technician must repair the cause of the
problem and push the RESET button first on the low
water cut-off control box, then on the display. This
situation is indicated by the red light on the display
and the word LOCKOUT flashing on the display.
During this lockout fault, the pump will be on as
indicated on the second line of the display.
1. If the boiler has a UL353 LWCO, check if the red
LED on the LWCO control box is illuminated. If so,
correct the low water condition and press the reset
button on the LWCO control box to reset the LWCO.
The LED should change to green. Press the reset
button on the front panel of the boiler to reset the
boiler control.
2. Check the flue for obstructions or any sign of
damage, especially signs of excessive heat. Repair
as necessary. Push the red reset button on the flue
temperature switch located on the flue inside the rear
access door of the boiler. NOTE: The switch
temperature must be less than 90°F to reset. Press
the reset button on the display. Run the boiler and
check the flue temperature by using both an external
thermometer in the flue pipe and the flue temperature
display in the status screens. If the flue temperature is
within specs and the switch trips, replace the switch. If
the flue temperature is excessive, check and adjust
combustion controls on the boiler. If the problem
persists, inspect the target wall in the combustion
chamber and replace it if cracked or damaged.
Fault Code F02
SUPPLY SENSOR F02
PUMP ON
Indicates that the supply temperature sensor of the
boiler has failed. This is a serious safety issue and
the boiler will not restart until the sensor is replaced
by a technician and he pushes the RESET button on
the display. This situation is indicated by the red light
on the display and the flashing word LOCKOUT.
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 on
the outlet manifold. Verify 5 VDC by checking in
Molex connector. If there is no 5 VDC, check the
harness. If harness is OK, replace control. NOTE: The
boiler will reset automatically. Verify thermistor values
by referencing chart in this manual.
2. Replace thermistor if necessary.
Summary of Contents for EL-110
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Page 89: ...89 Figure 35 LP 293 A NOTE Parts listed on the following page ...
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