58
TROUBLESHOOTING
Fault Code LOU
24 VOLT LOW
LOU
PUMP ON
Description:
This display indicates that the 24 volt power supply on the control is damaged or overloaded. This
code will reset 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: While 24 volt power is low, the pump out-
put will be on.
Remedy:
1. Check line voltage. Must be between 100-128 volts.
2. Disconnect TT wiring. If error clears, there is an issue in the thermostat wiring. Review exter-
nal wiring.
3. 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 at least 250. Use this as a troubleshooting guide as you follow the steps below.
4. Remove 12 pin Molex connector from the field wiring board. If the message clears, then the
problem is with external low voltage wiring. Examine the external low voltage sensor wiring
for shorts to ground repairing as necessary. If message is still present and the unit is so
equipped, disconnect the UL 353 low water cutoff to see if message clears. Replace faulty part.
Check low voltage wire harness in boiler for shorts to ground.
5. Remove the 20 pin Molex from the ECS board. If the message clears, examine the wiring to
the heating module and fan for shorts or grounds and repair as necessary.
6. If message only occurs when the burner tries to light, check gas valve for excessive current
draw.
7. If 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
Description:
This display indicates that the water in the tank has overheated. This code indicates a serious safety
issue and the unit will not restart until it cools down sufficiently and a technician repairs the cause of
the overheating and pushes the RESET button on the display. This is a serious situation and is indicat-
ed by the red light on the display flashing the word LOCKOUT on the display. During this lockout fault,
the pump will be on as indicated on the second line of the display in an effort to cool down the boiler.
Remedy:
1. Check central heating 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 hot and this message is displayed,
check the wiring to the water eco sensor and repair if necessary. If the wiring is correct and the
water is not excessively hot and this code is still present, replace the eco sensor.
PART 12: TROUBLESHOOTING
(CONTINUED)
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