User operation
18
MAXXfl o EVO Lite
3.8.1 Error codes (continued)
Error
Code
Error Code
Description
Diag.
Code
Notes
128
Loss of fl ame
during operation
244
625
Count of loss-of-fl ame incidents exceeded (a maximum of 15 loss of fl ame inci-
dents 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 elec-
trode.
253
Flame lost in modulation phase
130
Flue gas temper-
ature 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 ex-
ceeded
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 any OZW672 is powered and connected correctly.
151
BMU Internal
error
330
Error when closing ignition relay - Check ignition generator and connections from
controls - Replace control PCB if no fault found
331
Error when opening ignition relay - Check ignition generator and connections
from controls - Replace control PCB if no fault found
332
Error when closing gas valve relay - Check gas valve and connections from con-
trols - Replace control PCB if no fault found
333
Error when opening gas valve relay - Check gas valve and connections from
controls - Replace control PCB if no fault found
336
337
Internal safety relay error - Check if polarity of live and neutral has been reversed
to the appliance. Replace PCB if fault repeatedly occurs.
152
Parameterization
error
Any
Incorrect / confl icting parameters input (last changed parameters need to be
investigated).
All
others
Fan speed setting error. For example the ignition speed cannot be set lower than
the minimum fan speed - Review fan speeds and adjust.
153
Unit Locked
622
Temperature inside the appliance casing has exceeded 90
O
C. Check burner door
seals and door nuts are correctly tightened. Activating a 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
171
Fault input 1
Any
User defi ned OZW672 input D1 has been activated.
172
Fault input 2
Any
User defi ned OZW672 input D2 has been activated.
183
Unit in param-
eterisation mode
770
Code will be displayed when a programming stick is used but should clear when
programming is complete. Repeat stick operation if fault code persists
Any
Press reset after any programming has been actioned to remove lockout
