Installation, Operation and Maintenance Instructions User guide

LAARS Heating Systems
Page 74
Code Description Lockout
or Hold
Procedure
97 Internal Fault: A2D mismatch. L Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
98 Internal Fault: Exceeded VSNSR
voltage tolerance
L Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
99 Internal Fault: Exceeded 28V voltage
tolerance
L Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
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 ame is not present in the
combustion chamber. Correct any errors.
2. Make sure that the ame 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 ame 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, ame
detector, ame detector siting or ame rod
position.
5. If steps 1 through 4 are correct and the fault
persists, replace the module.
107 Flame lost early 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, ame
detector, ame detector siting or ame rod
position.
5. If steps 1 through 4 are correct and the fault
persists, replace the module.