Weil-McLain Aqua Balance WMB-155 Manual page 89

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AquaBalance
34 Troubleshooting
Figure 113
Troubleshooting suggestions — Fault displays and diagnostics
Fault
Code Fault
A01 No burner ignition
A02 Flame present signal
with burner off
A03 Over temperature pro-
tection activation
Exhaust duct safety
A04
device activation
A05 Fan protection activated
A06 1R ÀDPH DIWHU LJQL-
tion stage (6 times in 4
minutes)
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
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F10 Supply sensor 1 fault
F11 Return sensor fault
F12 DHW sensor fault
Part number 550-100-305/0118
M -
ALL OUNT GAS FIRED WATER BOILER
(continued)
Condition
No gas
Ignition/detection electrode fault
Electrode fault
Combustion incorrect
Natural gas & LP fuel
Faulty gas valve
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Condensate trap blocked and or con-
densate drain hose looped making a
second trap
Electrode fault
Card fault
Heating sensor damaged
No water circulation in the system
Air in the system/heat exchanger
Fault F07 generated 3 times in the last
24 hours
Fault F15 generated for 1 hour (con-
secutive)
Ignitor electrode fault
Flame unstable
Gas valve Offset fault
Air/fume ducts obstructed
Condensate trap blocked
The exhaust probe detects an excessive
temperature
Sensor damaged
Wiring shorted
Wiring disconnected
Sensor damaged
Wiring shorted
Wiring disconnected
Sensor damaged
Wiring shorted
Wiring disconnected
—
Boiler Manual
(continued)
Correction
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the air has been eliminated from the pipes.
Check the wiring of the electrode and that it is
correctly positioned and free of any deposits
Check the ignitor electrode wiring
Electrode deformed/misaligned and/or improper
gap (5/32")
Perform combustion test for Natural gas & LP
fuel per chart section Figure 102, page 77 and
Figure 105, page 78.
Check the gas valve and replace it if necessary
Check the gas supply pressure
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.
Check the ignitor electrode wiring
Electrode deformed/misaligned and/or improper
gap (5/32")
Check the card
Check the correct positioning and operation of
the heating sensor
Check the circulating pump
Vent the system/purge heat exchanger
See fault F07
See fault F15
Check the position of the ignitor electrode and
replace it if necessary
Check the burner
Check the Offset adjustment at minimum power
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ducts and air inlet and terminals
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.
Check the exchanger
Purge out air in heat exchanger
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Figure 102, page 77 and Figure 105, page 78.
Check piping sizes and required pump models
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the wiring or replace the sensor
89