Error Codes - andrews MAXXflo EVOCWH 120/302 Installation And Maintenance Manual

6.6 ERROR CODES

Error Error Code Description
Code
20 Boiler temperature 1, sensor
error
26 Common fl ow temperature
sensor error
28 Flue gas temperature, sensor
error
40 Return temperature 1, sensor
error
50 DHW temperature 1, sensor
error
81 LPB short-circuit or no power
supply
82 LPB address collision
83 BSB short circuit
84 BSB address collision
98 Extension module 1, error
99 Extension module 2, error
100 More than one clock time
master
102 Clock master without power
reserve
105 Maintenance message
Maintenance
Diag. Notes
Code
Other Boiler fl ow sensor (B2) is outside normal limits
439 Boiler fl ow sensor (B2) is short-circuit
440 Boiler fl ow sensor (B2) is open-circuit
Any Check connections or replace faulty sensor located on com-
mon fl ow pipe work up stand section (B10)
539 Flue gas sensor (B8) is short-circuit
543
540 Flue gas sensor (B8) is open-circuit
544
Other Boiler return sensor (B7) is outside normal limits
441 Boiler return sensor (B7) is short-circuit
442 Boiler return sensor (B7) is open-circuit
Any Check connections or replace faulty DHW tank sensor (B3)
Any LPB Short circuit or no bus power supply. Check operation of
OCI345 modules and connecting cables
Any LPB address duplicated on another Control PCB - Check ad-
dress of all control PCBs via parameter 6600
Any No BSB communication or wires shorted - Check operation of
GUI or OZW672 (if fi tted)
Any Two appliances connected through BSB (e.g. OZW672) have
the same allocation address. Change one of the appliances
address via parameter 6600
Any AGU2.5 confi guration error - Check parameters
Any AGU2.5 confi guration error - Check parameters
Any Only one device should be set as the time master, check on
the GUI (parameter 6640) and any OZW672 connected (in
case of connection to an OZW672, this device should be the
master)
Any The control PCB battery backup for the time clock has been
depleted following the restoration of power to the heater. If this
message has not cleared within 10 minutes of power being
turned on, turn the power off , wait 10 seconds and turn the
power on again. This message does not prevent the operation
of the heater in any way.
Any Item requiring attention but not preventing appliance operation
(e.g. 12 Month service due). Check details of message on the
appliance Front GUI screen.
79 MAXXfl o EVO