Maintenance
82
MAXXfl o EVO 150/302
6.6 ERROR CODES (CONTINUED)
Error
Code
Error Code Description
Diag.
Code
Notes
128
Loss of fl ame during opera-
tion
244
625
Count of loss-of-fl ame incidents exceeded (a maximum of 15
loss of fl ame incidents are permitted in a 24 hour period )
394
834
Flame lost in operation during safety time, before the start of the
modulation phase. Check the burner CO
2
is set correctly. Check
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
2
is set correctly. Check operation
and condition of the ionisation electrode.
253
Flame lost in modulation phase
130
Flue gas temperature too high Any
Check causes of high temperatures before operating Appliance.
Inspect inside of heat exchanger for dirt build up. Check CO
2
levels at min and max output.
133
Safety time exceeded
254
395
755
Records individual ignition failures and the times they have
occurred. Check gas supply, spark electrode, spark generator,
Ionisation probe, burner CO
2
setting and fl ue system
245
625
757
A total of 5 unsuccessful ignition attempts has occurred within a
24 hour period, resulting in a permanent lockout
142
Device failure (Bus)
Any
Check that the appliance and OZW672 is powered and con-
nected correctly.
151
BMU Internal error
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
337
Internal safety relay error - Check if polarity of live and neu-
tral has been reversed to the appliance. Replace PCB if fault
repeatedly occurs.
152
Parameterization error
Any
Incorrect / confl icting parameters input (last changed param-
eters need to be investigated).
153
Unit Locked
622
Temperature inside the appliance casing has exceeded 90
O
C.
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
849
Parameter update fi nished. Press reset to apply changes.
160
Fan speed threshold not
reached
233
749
Fan does not reach required speed setpoint via PWM control-
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
162
Air pressure switch
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.