andrews CWH120/200, Installation, Operation And Maintenance Manual

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MAXXflo Water Heater
36 36
A fault code will appear in the control panel display if there
is a lockout failure. A letter and the number of the burner
module appear alternately in the display. The letter A is for
a lockout fault and E is for a blocking fault. The two right
segments show a fault code, table 2 gives the meaning
of the different codes. If there is a fault in more than one
burner module, the display alternates every 5 seconds
between burner modules and their associated fault codes.
Lockout faults can be reset using the reset button. Only
the burner module for which the fault code appears in the
display at that moment is reset. Any E code (or blocking
fault) will require some form of rectification before it can be
reset, i.e. repair or replacement of a component or part. An
E code could indicate a fault in connection with the Master
or Slave boards.
FAULT CODES
MASTER BOARD BLOCKING CODES
E09 Control Error: Internal RAM location not correct
E12 Control Error: The incorrect parameters are
programmed in the slave board
E13 Control Error: A references measurement
indicated that the AD-circuit is defective, too low
E14 Control Error: A references measurement
indicated that the AD-circuit is defective, too
high
E15 Control Error: A references measurement
indicated that the AD-circuit is defective, too low
E16 Control Error: A references measurement
indicated that the AD-circuit is defective, too
high
E18 Control Error: Internal RAM
E19 Control Error: Not able to read parameters
E20 No slave board present
E22 Power Fault: The 50Hz has too large deviation
E60 Tank sensor opened circuit
E65 Return sensor opened circuit
E70 Tank sensor shorted
E75 Return sensor shorted
SLAVE BOARD BLOCKING CODES
E0 Read Error: Not able to read stored parameters
E28, E29, Control error: Reference measurements
E30, E31 indicates that there is an error in the AD circuit
E33 Flame detected when gas valve was closed
E41 Phase Error: Live and neutral reversed
E42 Phase Error: Too much deviation in the supply
voltage frequency
E44 Control Error: Poor communication between the
two processors
E47 Return sensor open circuit
E48 Flow sensor open circuit
E63 Return sensor short circuit
E64 Flow sensor short circuit
E78 Reset Error: Too many user resets
SLAVE BOARD LOCKOUT CODES
A01 Three Failed Ignitions: After three ignitions,
there was still no flame detected
A02 Overheat Stat Failure: No water flow conditions,
the flow sensor is not detecting a temperature
increase during operation
A03 The two flow sensors have too greater
temperature differential between them, 10°C for
more than 60 seconds
A05 Gas Valve Relay Error: The gas valve relay is not
switching correctly
A06 Safety Relay Error: The safety relay is not
switching correctly
A08 Fan Error: The fan is not reaching its target value
or speed for more than 60 seconds
A09 Control Error: Internal storage location
A10 The contents of the stored parameters are not
correct
A11 Flow Temperature: Flow temperature went above
95°C
A12 Control Error: The stored contents inside the
control are not matching the software version
A14 Control Error: Internal storage location
A15 Control Error: Internal storage location
A16 Control Error: Internal storage location
A17 Control Error: Internal storage location
A19 Control Error: Internal storage location
A20 Flame detection after gas valve is closed. Flame
still present 10 seconds after the gas valve is
closed
A21 Flame detected before opening of the gas valve
during the start up sequence
A24 Too many flame failures: When the flame fails
three times within on burn cycle
SECTION 6 • FAULT CODES