Primus D55, Service Manual, Page: 22 / 82

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Section 3 Troubleshooting
18. CYLINDER TURNS, BUT WILL NOT HEAT (continued)
24 VOLTS PRESENT AT OUTPUT
TERMINAL OF AIRFLOW SWITCH
YES
NO
CHECK FOR BROKEN OR LOOSE WIRE
TO STOVE HIGH LIMIT THERMOSTAT
24 VOLTS PRESENT AT INPUT
TERMINAL OF AIRFLOW SWITCH
YES
NO
REPLACE AIRFLOW SWITCH
24 VOLTS PRESENT AT OUTPUT
TERMINAL OF EXHAUST HIGH LIMIT
THERMOSTAT
YES
NO
CHECK FOR BROKEN OR LOOSE WIRE
TO AIRFLOW SWITCH
24 VOLTS PRESENT AT INPUT
TERMINAL OF CABINET LIMIT
THERMOSTAT
YES
NO
REPLACE CABINET LIMIT
THERMOSTAT
24 VOLTS PRESENT ON
ORG/BRN WIRE OF FAN MOTOR
YES
CHECK FOR BROKEN OR LOOSE WIRE
TO CABINET LIMIT THERMOSTAT