71 Rev. 2
SERVICING
SECTION INDEX
S-1 Checking Voltage 72
S-2 Checking Wiring 72
S-3 Checking Thermostat, Wiring, and Anticipator 72-73
S-4 Checking Transformer and Control Circuit 73
S-5 Checking Primary Limit Control 73-75
S-6 Checking Auxiliary Limit Control 75-76
S-7 Checking Flame Rollout Control 76
S-8 Checking Pressure Control 76-79
S-9 Checking Air Circulation Blower Motor
or Induced Draft Blower Motor 79
S-9A ECM Motor Interface Board 80
S-10 Checking Capacitor 80
S-10A Resistance Check 80-81
S-10B Capacitance Check 81
S-11 Checking Gas Valve 81
S-12 Checking Hot Surface Ignitor 81
S-13 Checking White-Rodgers 50A50 or 50A51
and Heatcraft HSI 1-1A or HSI-2 Ignition Control 81-82
S-13A Checking White-Rodgers 50A52 Ignition Control 82-83
S-14 Checking Flame Sensor 83
S-14A Checking Radiant Flame Sensor 84
S-15 Checking Main Burners 84
S-16 Checking Orifices 85
S-17 High Altitude Application (USA) 85
S-18 Checking Gas Pressure 86-88
S-19 Checking for Delayed Ignition 88
S-20 Checking for Flashback 88
S-21 Checking Duct Static 89
S-22 Checking Temperature Rise 89
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