Bradford White RE2H50 Mode D'emploi page 3

Fault Fault Counts Condition
Code Before Code
Displayed Displayed
Control checks to ensure evaporator is free of frost. Continuously verifies
10 that T3a sensor (evaporator inlet temperature) is greater than 20F after 30
FC**
minutes of run time.
Control checks to ensure evaporator superheat
Continuously verifies the temperature difference between T3a sensor (evap
10
inlet temp) and T3b sensor (evap outlet temp) is greater than 5F after 30
Fd**
mins of run time. Control also verifies that T3a is greater than 10F less than
T5 ambient sensor.
Control checks to ensure the compressor discharge temperature never
10 exceeds 240F. Continuously verifies that T4 sensor (compressor outlet
FE**
temperature) is less than 240F every minute of run time.
Control checks to ensure the Electronic Expansion Valve (EEV) is operating
properly and valve rotation is within range.
10
FF**
Control checks to ensure Ambient temperature is within an acceptable range
of 35ºF < [T5 ambient] <120ºF before starting the heat pump. If not, the unit
FG 10
will switch to Electric (Only) Mode for that heating cycle only.
NO fault code is shown on the display.
Control checks to ensure evaporator superheat
position is <450 after 30 minutes of run time. If outside these limits, this
FI** 10
provides an early indication of a refrigerant leak. (Note: Target superheat is
generally 10ºF, and EEV generally operates at a position much lower than
450.)
Control checks to ensure that the AC current draw is <= 20.5A while the
compressor and lower heating element are both enabled. If current draw is
FJ 10
>20.5A, the compressor will be disabled.
Control checks to ensure that T3a and T3b evaporator inlet and outlet
temperatures are within 2.5ºF of the T5 ambient temperature 20
FL 10
minutes after defrost begins.
T2 tank temperature sensor failure Just before compressor starts, control
1 checks T2 sensor is within 30F - 170F temperature range.
F2
Compressor failure. Control energizes compressor, but current sensor
10 detects no current flow.
F3
F4 10 Fan Failure
T3a sensor (evap inlet temperature) failure. The control detects the thermis-
10
tor output is at or nearly shorted or open circuit.
F5
T3b sensor (evap outlet temperature) failure. The control detects the ther-
10
mistor output is at or nearly shorted or open circuit.
F6
T4 sensor (compressor outlet) failure. The control detects the thermistor
10
output is at or nearly shorted or open circuit.
F7
T5 sensor (ambient temperature) failure. The control detects the thermistor
10
output is at or nearly shorted or open circuit.
F8
Lower heating element failure. Control energizes lower element, but cur-
F9 10
rent sensor detects no current flow.
Upper heating element failure. Control energizes Upper element, but cur-
F10 10
rent sensor detects no current flow.
Dry Tank fault. Control checks to ensure that the T2 tank temperature
sensor has not risen more than 5ºF during the first 22 minutes after the unit
is powered on. (The compressor is engaged for 20 minutes after a 2 minute
F11 1
wait for the system to allow the high and low side pressures to equalize.)
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 volt-
age1 minute after power-up, and if the voltage is below 155V, the fault code
bAd linE
will be displayed.
1
(F12)
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
1
button becomes free, the fault code will clear by itself.
F13
Filter LED is on, and audible alarm is sounding. Filter is too dirty to enable
proper function of unit. Number of "Dirty Filter" counts are stored in the
DirtyFilter**
"F14" code and can be monitored via the Control when it is placed in Diag-
5
nostics Mode. The evaporator is operating at a colder
(F14)
temperature than the ambient temperature as measured by T5.
DataFlash fault. The microcontroller has detected a problem in the Data-
F15 10
Flash (permanent memory storage).
Current transformer miswired. F3, F9, and F10 fault codes have all
F18 10 occurred during the same heating cycle.
Low line voltage during compressor operation. Sagging voltage occurs
F19 10 over time, not at startup like a fault F12- bAd linE.
Condensate drain pan port blocked. Water heater will only operate in
Electric (Only) mode until the drain port is cleared and the sensor
F20 10 is no longer in contact with water.
Application Update Failure. A problem occurred while updating the control
F21 1
application.
Parametric Data Update Failure. A problem occurred while updating
F22 1
parametric data.
Micro A/D Failure. The control has detected a microcontroller input port has
F23 10
failed.
* on some models ** Technicians use TB01-16
Check
Probable refrigerant leak. Find and Repair.
Check T3a sensor mounting, wiring and resistance.
Check EEV wiring at control, coil placement, and operation.
+ Possible refrigerant leak. Check sealed system for leak.
is OK (controlled by EEV).
Check that filter is clean. Check T3a, T3b and T5 sensor
mounting, wiring and resistance.
Check EEV wiring at control, coil placement, and operation.
Possible refrigerant leak. Check sealed system for leak.
Check T4 sensor mounting, wiring and resistance.
Check EEV wiring at control, coil placement, and operation.
Probable refrigerant leak. Find and Repair.
Check EEV wiring at control, placement of EEV coil on
EEV valve body, and operation. Confirm audible pulse of
valve homing sequence at power restart.
Check T3a and T3b sensors mounting, wiring and
resistance.
No failure is assumed, but this information is provided for
completeness.
Probable refrigerant leak. Find and Repair.
+
is <20ºF AND the EEV
Check T3a, T3b, T5 sensor mounting, wiring and resist-
ance.
Check EEV wiring at control, coil placement, and operation.
Check lower heating element rated wattage. Element
wattage is stamped on the heating element terminal block.
Correct wattage can be found on the water heater's rating
plate.
Check airflow: fan operation, dirty filter, dirty evaporator.
Check T3a, T3b, T5 sensor mounting, wiring and resist-
ance. Check EEV wiring at control, coil placement, and
operation.
Check T2 sensor mounting, wiring and resistance.
Use
If T2 sensor checks OK, control assembly may have failed.
Check compressor run capacitor.
Check compressor, overloads, relay and wiring.
Use service mode to manually cycle compressor on/off.
Check fan, wiring, and control connection.
Check respective temperature sensor mounting, wiring to
control and resistance.
Use service mode to monitor sensor temperature.
If temperature sensor checks OK, control assembly may
have failed.
Check respective heating element and wiring connections
at element and control.
Use service mode to cycle element and check current
draw. Control assembly may have failed.
Check to ensure the tank is full of water. If full:
Check T2 sensor mounting, wiring and resistance.
Use service mode to monitor T2 sensor temperature.
If T2 checks OK, control assembly may have failed.
Check electrical supply line connections. Voltage should
measure within +10/-15% of either 208 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 heating elements are not shorted
to ground.
Check to see if all buttons are operable.
Ensure control board is fully snapped into control housing.
If board is fully seated, 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
are an indication of a sealed system leak. Find and repair
AND flash software to version 4.21 or later, or replace
control.
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
replaced
Check incoming line voltage is within +10/-15% of either
208 or 240 VAC, depending upon power supply.
Check heating elements are not shorted to ground.
Check main drain on condensate drain pan. Unblock if
necessary. Check that the sensor is in the correct position
in the drain pan, on the screw post near the main drain
port. Ensure drain fittings do not reduce diameter at the
drain pan port and cause water to build up in pan.
Cycle power and try to complete the update again. If prob-
lems persist, reflash software or replace the control board.
Cycle power and try to complete the update again. If prob-
lems persist, reflash software or replace the control board.
The control needs to be replaced.
service mode to monitor T2 sensor temperature.
238-52395-00 02/18