LAARS Heating Systems
Page 92
100
Pressure Sensor Fault
H
1. Verify the Pressure Sensor is a 4-20 ma
source.
2. Check wiring and correct any possible errors.
3. Test Pressure Sensor for correct operation.
4. Replace the Pressure sensor.
5. If previous steps are correct and fault persists,
replace the module.
105
Flame detected out of sequence
H or L
1. Check that flame is not present in the
combustion chamber. Correct any errors.
2. Make sure that the flame detector is wired to
the correct terminal.
3. Make sure the F & G wires are protected from
stray noise pickup.
4. Reset and sequence the module, if code
reappears, replace the flame detector.
5. Reset and sequence the module, if code
reappears, replace the module.
106
Flame lost in MFEP
L
1. Check main valve wiring and operation - correct
any errors.
2. Check the fuel supply.
3. Check fuel pressure and repeat turndown tests.
4. Check ignition transformer electrode, flame
detector, flame detector siting or flame rod
position.
5. If steps 1 through 4 are correct and the fault
persists, replace the module.
107
Flame lost early in run
L
108
Flame lost in run
L
1. Check main valve wiring and operation - correct
any errors.
2. Check the fuel supply.
3. Check fuel pressure and repeat turndown tests.
4. Check ignition transformer electrode, flame
detector, flame detector siting or flame rod
position.
5. If steps 1 through 4 are correct and the fault
persists, replace the module.
109
Ignition failed
L
110
Ignition failure occurred
H
Hold time of recycle and hold option. Will not be
a lockout fault. Hold Only. Internal hardware test.
Not a lockout.
111
Flame current lower than weak
threshold
H
Hold time of recycle and hold option. Will not be
a lockout fault. Hold Only. Internal hardware test.
Not a lockout.
113
Flame circuit timeout
L
Flame sensed during Initiate or off cycle, hold 240
seconds, if present after 240 seconds, system will
lockout.
119
Control Interaction Fault
H
Flap valve identifications configured incorrectly.
