Weil-McLain Aqua Balance WMB-120, Manual

Page: 89 / 132

Part number 550-100-305/0118
89
AquaBalance TM
W
ALL
M
OUNT GAS
-
FIRED WATER BOILER
—
Boiler Manual
34 Troubleshooting
(continued)
Figure 113
Troubleshooting suggestions — Fault displays and diagnostics
(continued)
Fault
Code Fault
Condition Correction
A01 No burner ignition
No gas
ƒjX„^jXX!`Q"!"#$;^^jX \QX"]^j"^
the air has been eliminated from the pipes.
Ignition/detection electrode fault
Check the wiring of the electrode and that it is
correctly positioned and free of any deposits
Electrode fault
Check the ignitor electrode wiring
Electrode deformed/misaligned and/or improper
gap (5/32”)
Combustion incorrect
Natural gas & LP fuel
Perform combustion test for Natural gas & LP
fuel per chart section Figure 102, page 77 and
Figure 105, page 78.
Faulty gas valve Check the gas valve and replace it if necessary
>]#`{\X]^!"##`€€Q†€X##`X Check the gas supply pressure
Condensate trap blocked and or con-
densate drain hose looped making a
second trap
Check the trap and clean it if necessary
Also inspect gas valve, blower, venturi, igniter,
and heat exchanger, and replace those with
signs of damage.
A02 Flame present signal
with burner off Electrode fault
Check the ignitor electrode wiring
Electrode deformed/misaligned and/or improper
gap (5/32”)
Card fault Check the card
A03 Over temperature pro-
tection activation
Heating sensor damaged
Check the correct positioning and operation of
the heating sensor
No water circulation in the system Check the circulating pump
Air in the system/heat exchanger Vent the system/purge heat exchanger
A04
Exhaust duct safety
device activation
Fault F07 generated 3 times in the last
24 hours
See fault F07
A05 Fan protection activated
Fault F15 generated for 1 hour (con-
secutive)
See fault F15
A06 ?$"ZX"^X\!]\-
tion stage (6 times in 4
minutes)
Ignitor electrode fault
Check the position of the ignitor electrode and
replace it if necessary
Flame unstable Check the burner
Gas valve Offset fault Check the Offset adjustment at minimum power
Air/fume ducts obstructed
ˆXZ‰X^jX #^`^\]Z^jX$`XŠX‹j"`#^
ducts and air inlet and terminals
Condensate trap blocked
Check the trap and clean it if necessary
Also inspect gas valve, blower, venturi, igniter,
and heat exchanger, and replace those with
signs of damage.
F07 High exhaust tempera-
ture
Air trapped in boiler heat
exchanger
Combustion not correct
for Natural gas and LP
fuel
Boiler water piping and
circulator not providing
X^;"^X$;
The exhaust probe detects an excessive
temperature Check the exchanger
Purge out air in heat exchanger
ƒjX„Z `#^\]€X#€X\{"^\]j"^#
Figure 102, page 77 and Figure 105, page 78.
Check piping sizes and required pump models
F10 Supply sensor 1 fault
Sensor damaged
Check the wiring or replace the sensor Wiring shorted
Wiring disconnected
F11 Return sensor fault
Sensor damaged
Check the wiring or replace the sensor Wiring shorted
Wiring disconnected
F12 DHW sensor fault
Sensor damaged
Check the wiring or replace the sensor Wiring shorted
Wiring disconnected