Laars MAGNATHERM MGH2000, Installation And Operation Instructions For

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MagnaTherm Boilers and Water Heaters Page 71
code Description Lockout
or Hold
Procedure
26 internal fault:
Static flame ripple
H internal fault
1. Reset module
2. if fault repeats, replace module.
27 internal fault:
Flame rod shorted to ground detected H internal fault
1. Reset module
2. if fault repeats, replace module.
28 internal fault:
A/D linearity test fails H internal fault
1. Reset module
2. if fault repeats, replace module.
29 internal fault:
Flame bias cannot be set in range H internal fault
1. Reset module
2. if fault repeats, replace module.
30 internal fault:
Flame bias shorted to adjacent pin H internal fault
1. Reset module
2. if fault repeats, replace module.
31 internal fault:
SLO electronics unknown error H internal fault
1. Reset module
2. if fault repeats, replace module.
32-46 internal fault:
Safety Key 0 through 14
L internal fault
1. Reset module
2. if fault repeats, replace module.
47 Flame Rod to ground leakage H internal fault
1. Reset module
2. if fault repeats, replace module.
48 Static flame (not flickering) H internal fault
1. Reset module
2. if fault repeats, replace module.
49 24 VAc voltage low/high H 1. check the module and display connections.
2. check the module power supply and make
sure that frequency, voltage and VA meet the
specifications.
50 Modulation fault H internal sub-system fault.
1. Review alert messages for possible trends.
2. correct possible problems.
51 Pump fault H internal sub-system fault.
1. Review alert messages for possible trends.
2. correct possible problems.
52 Motor tachometer fault H internal sub-system fault.
1. Review alert messages for possible trends.
2. correct possible problems.