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Troubleshooting Guide
up to three times. After three failed ignition attempts,
the board will enter a 1 hour lockout.
6. Once flame has been established, the control will enter
a warm-up period to ensure flame stabilization and
reduce condensation in the heat exchanger.
7. After the warm-up period, the control will enter the run
cycle. During the run cycle, the burner firing rate and
draft inducer pressure are determined based on the
heat demand received by the control via a Modbus
signal or the analog thermostat.
Note: If the control is paired with a split manifold, steps 1
through 6 pertain to the primary burners. Once the
control exits the warm-up period and the firing rate
is dictated by the rooftop control, the control will
ignite the secondary burners and modulate the
primary burners based on the demand for heat.
8. The run cycle will continue until any of the following
conditions are met.
Table 7.
Troubleshooting guide for VB1287
Failure
Code
eFLAME_SPLIT
21
eAIR_FLOW_LOW
43
eAIR_FLOW_HIGH
44
eAIR_ZERO_LO
41
eAIR_ZERO_HIGH
eNO_IGNITION_PRIME
12
eNO_IGNITION_SPLIT
22
eFLAME_DROP_OUT_PR
33
IMARY
eFLAME_DROP_OUT_SP
23
LIT
30
Description of Symptom
Flame is detected without call for heat
Low pressure switch is open
High pressure switch is open
Low pressure switch closed at start
High pressure switch closed at start
Primary burner exceeds a number of trials
for ignition
Split burner exceeds number of trials for
ignition, primary burner remains
operational
Primary burner flame loss count exceeds
a threshold
Split burner flame loss count exceeds a
threshold
a. The call for heat is terminated.
b. Any of the safety devices (high limit, air pressure,
rollout, etc.) are triggered.
c. The control reaches it's maximum run time of 6
hours. If this condition is reached, the control will
terminate the run cycle, continue through the
proper sequence of operations, and then
immediately enter the system check and pre-purge
cycles to prepare for re-ignition, assuming
conditions A and B haven't been met.
9. Once the run cycle has terminated, the redundant
safety valve will close, the modulating valve will return
to its set position, and the draft inducer will ramp up to
its "light-off" setting for a 45 second post-purge cycle.
10. After the conclusion of the post-purge, the control will
enter the "OFF" state. All system outputs are de-
energized but all safety devices are still monitored.
1.
Ensure there is no voltage to gas valve—repair/replace wiring if
voltage is present.
2.
If voltage is not present, check for gas flow. If gas is flowing, verify
line and manifold pressures before replacing valve.
1.
Failed combustion blower.
2.
Check pressure hoses for leaks or blockage.
3.
Check for blockage in the inducer barb fitting.
4.
Check for condensate accumulation in the pressure switch and
hose.
5.
Check the pressure switch wiring.
6.
Replace the pressure switch.
1.
Check wiring to the pressure switch and draft inducer.
2.
Check pressure switch for closed contact using an OHM meter.
3.
Replace the pressure switch.
1.
Verify gas supply available and manifold pressure is correct.
2.
Verify the gas valve is in the ON position.
3.
Verify that a spark in present; if not check igniter for debris
between the electrodes, for cracked ceramic and check ignition
wire for cracks.
4.
Check to see if the sensor ceramic is cracked or if the electrode
wire is coated with dirt or oils.
5.
Check to see if the flame sensor wire is connected properly and not
grounded due to wire abrasions.
6.
Check for air leaks.
7.
Check for re-circulation of flue product.
1.
Check to see if the sensor ceramic is cracked or if the electrode
wire is coated with dirt or oils. Clean or replace.
2.
Check to see if the senor wire is connected properly and not
grounded due to wire abrasions.
3.
Check for re-circulation of flue product.
4.
Check to see if the flame is unstable or floating away from the
senor.
5.
Check that all burner components are assembled correctly and all
seals are tight.
Actions
CLCH-SVX014B-EN
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