lp-657 Rev. 001 Rel. 000 Date 12.10.18
56
24 VOLT LOW LOU
PUMP ON
LOU indicates 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 the 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 a PC and use HTP service software
to 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 the customer
connection board. If the message clears the problem is
with 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 when the low voltage harness
is disconnected from the 926 control board, replace the
926 control board.
WATER HIGH TEMP F00
PUMP ON
F00 indicates the water in the boiler has
overheated. The boiler will not restart until it
cools sufficiently and a technician determines
and repairs the cause of overheating 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 in an effort to cool the
boiler down.
1. Check circulator pump operation.
2. If the circulator pump is running, ensure there is water
in the system and that the water is moving through the
system as intended. Ensure 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.
FLUE TEMP/WAT LV F01
PUMP ON
F01 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.
SUPPLY SENSOR F02
PUMP ON
F02 indicates the supply 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.
1. Check the electrical connection to the thermistor on
the outlet manifold. Verify 5 VDC by checking the Molex
connector. If there is no 5 VDC, check the harness. If
harness is OK, replace the control. Verify thermistor
values by referencing chart in this manual.
2. Replace thermistor if necessary.
NOTE:
The boiler will reset automatically once the fault
is corrected.
Summary of Contents for Elite FT EFT-285
Page 22: ...lp 657 Rev 001 Rel 000 Date 12 10 18 22 Figure 9 Piping Symbol Legend ...
Page 41: ...lp 657 Rev 001 Rel 000 Date 12 10 18 41 Figure 31 Internal Connection Diagram ...
Page 66: ...lp 657 Rev 001 Rel 000 Date 12 10 18 66 Figure 36 Cabinet Replacement Parts ...
Page 69: ...lp 657 Rev 001 Rel 000 Date 12 10 18 69 Maintenance Notes ...