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Fault codes.
fault
fault
Condition
Code
Counts
dis-
Before
played
Code
dis-
played
T5 sensor (ambient temperature) failure. The control detects
F8
10
the thermistor output is at or nearly shorted or open circuit.
Lower heating element failure. Control energizes lower
F9
10
element, but current sensor detects no current flow.
Upper heating element failure. Control energizes Upper
F10
10
element, but current sensor detects no current flow.
Dry Tank fault. This test is run within the first 22 minutes
after the unit has powered on. (The compressor is engaged
for 20 minutes after a 2minute wait for the system to allow
the high and low side pressures to equalize.) The tank
F11
1
temperature, T2, is read and verified it has not risen more
than 5 deg F. If it has, this indicates there is not enough
water in the tank for water heater operation. After 1 failed
Dry Tank test, "F11" is displayed. After 5 failed tests, an
audible alarm will sound.
The voltage is too low at power-up. The control monitors the
input line voltage1 minute after power-up, and if the voltage
bAd linE
1
is below 155V, the fault code will be displayed.
(F12)
Stuck Key fault. This indicates there is a button on the front
panel that is stuck down. This button is inoperable. Other
F13
1
buttons work normally. If the button becomes free, the fault
code will clear by itself.
Filter LED is on, and audible alarm is sounding. Filter is too
dirty to enable proper function of unit. Number of "Dirty
Dirty
Filter" counts are stored in the "F14" code and can be
Filter
5
monitored via the Control when it is placed in Diagnostics
(F14)
Mode. The evaporator is operating at a colder temperature
than the ambient temperature as measured by T5.
DataFlash fault. The microcontroller has detected a
F15
10
problem in the DataFlash (permanent memory storage).
Current transformer miswired. F3, F9, and F10 fault codes
F18
10
have alloccured during the same heating cycle.
F19
10
Low Line Voltage.
Condensate drain pan port blocked. Water heater will only
operate in standard/electric mode until the drain port is
F20
10
cleared and the sensor is no longer in contact with
Application Update Failure. A problem occurred while
F21
1
updating the control application.
Parametric Data Update Failure. A problem occurred while
F22
1
updating parametric data.
Micro A/D Failure. The control has detected a
F23
10
microcontroller input port has failed.
* Some Models
22
Check
Check T5 sensor mounting, wiring and resistance.
Use service mode to monitor T5 sensor temperature.
Control assembly may have failed.
Check lower heating element and wiring.
Use service mode to cycle element and check current
draw. Control assembly may have failed.
Check Upper heating element and wiring.
Use service mode to cycle element and check current
draw. Control assembly may have failed.
Check to ensure the tank is full of water.
Check T2 sensor mounting, wiring and resistance.
Use service mode to monitor T2 sensor temperature.
Control assembly may have failed.
Check electrical supply line connections. Voltage should
measure either 208 VAC or 240 VAC, depending upon
power supply. Badline counts stored in "F12" and can be
monitored via the Control when placed in diagnostics
mode.
Check to see if all buttons are operable.
Control assembly has failed
Check to ensure Filter is clean. Filter cleaning instructions
are found in the owner's manual.
Repeated dirty filter alarms that do not resolve by cleaning
the filter may be an indication of a fan failure.
Control assembly may have failed.
Check that red L2 wire is through the CT201 current
transformer on the board. If it is, board needs to be re-
placed
Check incoming line
Check main drain on condensate drain pan. Unblock if
necessary. Check that the sensor is in the correct position
water.
in the drain pan, on the screw post near the main drain
port.
Cycle power and try to complete the update again.
If problems persist, replace the control board.
Cycle power and try to complete the update again.
If problems persist, replace the control board.
The control needs to be replaced.
voltage.
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