Fault Codes - andrews CWH30/100 Installation Manual, Operation And Maintenance Manual

FAULT CODES

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 meanings 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 faults)
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.
Table 2. 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
Control Error: Reference measurements indicates
E28, E29
that there is an error in the AD circuit
E30, E31
E33 Flame detected when gas valve was closed
E41 Phase Error: Live and netural 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 ignition, 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, 10ºC for more than 60
seconds
A05 Gas Valve Relay Error: The gas valve relay is not
switch 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
95ºC
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 as 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 failures
three times within one burn cycle
SECTION 6
FAULT
CODES
35