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TROUBLESHOOTING

Code

Description

Remedy

F00

High temperature switch
limit exceeded (194°)

1. Try reset, if F00 repeats, create a demand for hot water

(

DANGER: use caution to prevent burn injury)

water is above 194°

test upper and lower temperature sensor with an ohmmeter. (Refer to resistance chart,

this section.) Replace bad sensor.

If water is below 194°

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 PHOENIX 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 then 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, then push the red reset button on the flue switch.

3. Be sure the Phoenix is connected to a water supply and full of water.
4. Push the RESET button on the Phoenix control panel. The appliance should light. If the appliance lights

proceed to step 5. If the appliance 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 Phoenix appliance. The exhaust temperature should not rise above 190 Deg. F after several minutes
of operation.

6. If the flue temperature is below 190 Deg. F and the appliance 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 Deg. F, Consult the HTP factory for further assistance.

F02

Interrupted or shorted
upper temperature sensor

Check the electrical connection to the appropriate temperature sensor, if connection is okay, replace bad
sensor.

F03

Interrupted or shorted
lower temperature sensor

F05

Upper temperature sensor
exceeds 194°F

If water in tank is not greater than 194°F, check wiring and repair if faulty. If the wiring is okay, check
appropriate sensor with ohmmeter and compare to reading in resitance chart. If reading does not agree with
water temperature, replace bad sensor.

F06

Lower temperature sensor
exceeds 194°F

F09

No flame detected – The
Phoenix 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 water 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 Phoenix 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 water 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.

F11

False Flame Signal – The
water 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.

F13

Combustion Fan Speed
Incorrect – The water heater
will lock out if it senses that
the fan speed is less than
70% of expected rate for
more than 60 seconds.

1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.

Table 8-3: 926 Control Board FAULT Codes

PART 8: TROUBLESHOOTING

(CONTINUED)

NOTE:

IF YOU REPLACE A PART TO REMEDY A FAULT, IT IS RECOMMENDED THAT YOU CYCLE
THE UNIT AT LEAST THREE OR FOUR TIMES TO ASSURE THE FAULT HAS BEEN RESOLVED.