27
Fault codes cont.-
Fault Code
Displayed
Fault Counts Before
Code Displayed
Condition
F8
10
T5 sensor (ambient temperature) failure. The control detects the
thermistor output is at or nearly shorted or open circuit.
F9
10
Lower heating element failure. Control energizes lower element, but
current sensor detects no current flow.
F10
10
Upper heating element failure. Control energizes upper element, but
current sensor detects no current flow.
F11
1
Dry tank fault. This test is run within the first 22 minutes after the water
heater has powered on (The compressor is engaged for 20 minutes
after a 2 minute wait for the system to allow the high and low side
pressures to equalize). The tank temperature, T2, is read and verified it
has not risen more than 5°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.
bAd linE
F12
1
The voltage is too low at power-up. The control monitors the input line
voltage one minute after power-up, and if the voltage is below 155
VAC, the fault code will be displayed.
F13
1
Stuck key fault. This indicates there is a button on the front panel that is
stuck down. This button is inoperable. Other buttons work normally. If
the button becomes free, the fault code will clear by itself.
Dirty Filter
(F14)
5
Filter LED is on, and audible alarm is sounding. Filter is too dirty to
enable proper functio
n of water heater. Number of “Dirty Filter” counts
are stored in the “F14” code and can be monitored via the control when
it is place in Diagnostics Mode. The evaporator is operating at a colder
temperature than the ambient temperature as measure by T5.
F15
10
DataFlash fault. The microcontroller has detected a problem in the
DataFlash (permanent memory storage).
F16*
1
Anode Depleted. Anode LED is on, and the audible alarm is sounding.
The control has calculated that the anode rod has been mostly
consumed, or the time in operation has exceeded the replacement
timeline threshold.
F17*
1
Anode Depletion miswire condition or shorted to ground. The control
has detected that the anode circuit has a corrosion current signal
≤0.25mA.
F18
10
Current transformer miswired. F3, F9, and F10 fault codes have all
occurred during the same heating cycle.
F19
10
Low line voltage.
F20
10
Condensate drain port blocked. Water heater will only operate in
standard/electric mode until the drain port is cleared and the sensor is
no longer in contact with water.
F21
1
Application Update Failure. A problem occurred while updating the
control application.
F22
1
Parametric Data Update Failure. A problem occurred while updating
parametric data.
F23
10
Micro A/D Failure. The control has detected a microcontroller input port
has failed.
*On some models
Summary of Contents for RE2H50S 1NCWT Series
Page 28: ...28 Notes...
