Laars MagnaTherm MGH1600 Installation And Operation Instructions Manual page 84

Page 80
Code Description
97 Internal Fault: A2D mismatch.
98 Internal Fault: Exceeded VSNSR
voltage tolerance
99 Internal Fault: Exceeded 28V voltage
tolerance
100 Pressure Sensor Fault
105 Flame detected out of sequence
106 Flame lost in MFEP
107 Flame lost early in run
Lockout Procedure
or Hold
L Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
L Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
L Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
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.
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.
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.
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.
LAARS Heating Systems