Laars MagnaTherm MGH1600 Installation And Operation Instructions Manual page 82

Page 78
Code Description
53 AC input phases reversed
59 Internal Fault: Mux pin shorted
61 Anti short cycle
62 Fan speed not proved
63 LCI (Limit Control Input) OFF
64 PII (Pre-Ignition Interlock) OFF
67 ILK (Interlock) OFF
68 ILK (Interlock) ON
70 Wait for leakage test completion
78 Demand Lost in Run
Lockout Procedure
or Hold
L 1. Check the module and display connections.
2. Check the module power supply and make
sure that both frequency and voltage meet the
specifications.
3. On 24 VAC applications, assure that J4 terminal
10 and J8 terminal 2 are connected together.
L Internal Fault.
1. Reset module.
2. If fault repeats, replace module.
H Will not be a lockout fault. Hold Only.
H Will not be a lockout fault. Hold Only.
H 1. Check wiring and correct any faults.
2. Check Interlocks connected to the LCI to assure
proper function.
3. Reset and sequence the module; monitor the
LCI status.
4. If code persists, replace the module
H or L 1. Check wiring and correct any faults.
2. Check Preignition Interlock switches to assure
proper functioning.
3. Check the valve operation.
4. Reset and sequence the module; monitor the PII
status.
5. If code persists, replace the module.
H or L 1. Check wiring and correct any possible shorts.
2. Check Interlock (ILK) switches to assure
proper function.
3. Verify voltage through the interlock string to
the interlock input with a voltmeter.
4. If steps 1-3 are correct and the fault persists,
replace the module.
H or L 1. Check wiring and correct any possible shorts.
2. Check Interlock (ILK) switches to assure
proper function.
3. Verify voltage through the interlock string to
the interlock input with a voltmeter.
4. If steps 1-3 are correct and the fault persists,
replace the module.
H 1. Internal Fault. Reset module.
2. If fault repeats, replace module.
H 1. Check wiring and correct any possible errors.
2. If previous steps are correct and fault persists,
replace the module.
LAARS Heating Systems