andrews MAXXflo EVO CWH 150/302 Installation And Maintenance Manual page 82

6.6 ERROR CODES (CONTINUED)
Error Error Code Description
Code
128 Loss of fl ame during opera-
tion
130 Flue gas temperature too high Any
133 Safety time exceeded
142 Device failure (Bus)
151 BMU Internal error
152 Parameterization error
153 Unit Locked
160 Fan speed threshold not
reached
162 Air pressure switch
Maintenance
Diag. Notes
Code
244 Count of loss-of-fl ame incidents exceeded (a maximum of 15
625 loss of fl ame incidents are permitted in a 24 hour period )
394 Flame lost in operation during safety time, before the start of the
834 modulation phase. Check the burner CO
operation and condition of the ionisation electrode.
854 Flame lost in operation within the fi rst 7 seconds after safety
time. Check the burner CO
and condition of the ionisation electrode.
253 Flame lost in modulation phase
Check causes of high temperatures before operating Appliance.
Inspect inside of heat exchanger for dirt build up. Check CO
levels at min and max output.
254 Records individual ignition failures and the times they have
395 occurred. Check gas supply, spark electrode, spark generator,
755 Ionisation probe, burner CO
245 A total of 5 unsuccessful ignition attempts has occurred within a
625 24 hour period, resulting in a permanent lockout
757
Any Check that the appliance and OZW672 is powered and con-
nected correctly.
330 Error when closing ignition relay - Check ignition generator and
controls connections - Replace control PCB if no fault found
331 Error when opening ignition relay - Check ignition generator and
controls connections - Replace control PCB if no fault found
332 Error when closing gas valve relay - Check gas valve and con-
trols connections - Replace control PCB if no fault found
333 Error when opening gas valve relay - Check gas valve and con-
trols connections - Replace control PCB if no fault found
336 Internal safety relay error - Check if polarity of live and neu-
337 tral has been reversed to the appliance. Replace PCB if fault
repeatedly occurs.
Any Incorrect / confl icting parameters input (last changed param-
eters need to be investigated).
622 Temperature inside the appliance casing has exceeded 90
Check heat engine door seals and door nuts are correctly
tightened. Pressing the reset for more than 10 seconds will also
produce this lockout.
848 Parameter update fi nished. Press reset to apply changes.
849
233 Fan does not reach required speed setpoint via PWM control-
749 Check wiring and operation of fan. Replace fan if necessary
377 Fan speed not reached - Home run stage
378 Fan speed not reached - Standby stage
379 Fan speed not reached - Ignition stage
380 Fan speed not reached - Pre purge stage
381 Fan speed not reached - Post purge stage
Any Air pressure switch (APS) has activated or is open circuit. Check
fl ue restriction or incorrect fl ue installation. Check APS function
(Open circuit at 365 Pa). Check the condensate pipe system is
free to fl ow into the trap and beyond.
82
is set correctly. Check
2
is set correctly. Check operation
2
setting and fl ue system
2
MAXXfl o EVO 150/302
2
C.
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