HTP phoenix plus PHP199-119, Инструкция по установке, запуску и эксплуатации, Страница: 46 / 56

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LP-454 REV. 1.6.15
LOU 24 Volt Low Until Corrected
1. Check line voltage. Must be between 100
– 128 volts.
2. If available, connect a PC and, using HTP service software, check the 24v supply
display in the lower left corner of the screen. The number displayed must be greater
than 128 and should be greater than 250. Use this as a troubleshooting guide as you
follow the steps below.
3. Remove 10 pin Molex connector from customer connection board. If LOU clears,
the problem is with external sensor wiring. Examine external sensor wiring for shorts
to ground, repairing as necessary. If LOU code is still present and the heater is so
equipped, disconnect high gas pressure switch, then low gas pressure switch, then
UL 353 low water cutoff in this order, one at a time, to see if LOU code clears.
Replace faulty part. Check low voltage wire harness in heater for shorts to ground.
4. If LOU only occurs when burner tries to light, check gas valve for excessive current
draw.
5. If LOU is present with the low voltage harness disconnected from the 926 control
board, replace the 926 control board.
Table 13
– Control Board Error Codes
926 CONTROL BOARD FAULT CODES
CODE DESCRIPTION REMEDY
F00
High temperature switch limit
exceeded 194
o
F.
1. Try reset. If F00 repeats, create a demand for hot water. (DANGER: Use caution to prevent burn
injury.) If water is above 194
o
F, test upper and lower temperature sensor with an ohmmeter. (Refer to
resistance chart, this section.) Replace bad sensor. If water is below 194
o
F, test high temperature switch and
wiring with ohmmeter. Switch should be closed at this point. If not, replace switch.
2. If unit did reset successfully, let the heater run and go into the status menu to check the upper and lower
temperature sensor. If either reading displayed does not make sense, check appropriate sensor with
ohmmeter. (Refer to resistance chart, this section.) Replace bad sensor. Do an OHMs reading on both
sensors to check continuity.
F01
Vent temperature limit
exceeded.
1. Inspect all flue piping. If the flue is damaged or shows signs of overheating, repair or replace the flue parts
as necessary before proceeding.
2. If the flue piping system is intact, not damaged and there is no sign of the flue overheating (such as
discoloration or melting), push the red reset button on the flue switch
3. Be sure the heater is connected to a water supply and full of water.
4. Push the RESET button on the heater control panel. The water heater should light. If the water heater
lights, proceed to step 5. If the water heater does not light and the display again begins to flash F01, inspect
the wiring to the flue switch, repairing or replacing as necessary. If the wiring is intact, replace the flue
switch, using care to mount the new flue switch in the same position and mounting holes as the old one. If
the display flashes a code other than F01, follow the troubleshooting guide for that code.
5. Observe operation for 5 minutes. Place the probe of an exhaust analyzer into the flue system within 6 feet
of the heater. The exhaust temperature should not rise above 190
o
F after several minutes of operation.
6. If the flue temperature is below 190
o
F and the heater again goes into lockout displaying F01, replace the
flue switch, using care to mount the new flue switch in the same position and mounting holes as the old one.
If the display flashes a code other than F01, follow the troubleshooting guide for that code.
7. If the flue temperature increases to over 190
o
F, consult HTP for further assistance.
F02
Interrupted or shorted upper
temperature sensor. 1. Check the electrical connection to the appropriate temperature sensor.
2. If connection is okay, replace bad sensor.
F03
Interrupted or shorted lower
temperature sensor.
F05
Upper temperature sensor
exceeds 194
o
F.
1. If water in tank is not greater than 194
o
F, check wiring. Repair if faulty.
2. If wiring is okay, check appropriate sensor with ohmmeter and compare to reading in resistance chart
above. If reading does not agree with water temperature, replace bad sensor.
F06
Lower temperature sensor
exceeds 194
o
F.
F09
No flame detected
– Heater
will make three attempts at
ignition before the control goes
into this lockout condition. Will
reset in 1 hour.
1. Watch the igniter through the observation window provided.
2. If there is no spark, check the spark electrode for the proper ¼” gap.
3. Remove any corrosion from the spark electrode and flame rectifier probe.
4. If there is a spark but no flame, check the gas supply to the heater.
5. If there is a flame, check the flame sensor.
6. Check any flue blockage or condensate blocks.
F10
Loss of flame signal
– The
heater will relight 4 times
before the control goes into
this lockout condition. Will
reset in 1 hour.
1. Monitor the gas pressure to the unit while in operation.
2. Assure that the flame is stable when lit.
3. Check to see if the green light on the display module is out while the heater is running.
4. If the green light doesn’t come on or goes off during operation check the flame signal on the status menu.
5. If the signal reads less than 1 microampere, clean the flame rectifier probe.
6. If the flame rectifier probe continues to read low, replace it.
F11F
False flame signal
– The
heater will lock out if it senses
a flame signal when there
should be none present.
1. Turn the gas off to the unit at the service valve.
2. If the flame signal is still present replace the igniter.
3. If the flame signal is not present after turning off the gas supply, check the gas valve electrical connection.
4. If there is no power to the gas valve, remove the valve and check for obstruction in the valve seat or
replace the gas valve.
5. Turn the gas on at the service valve after corrective action is taken.