Primus D55, Service Manual, Page: 21 / 82

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19
Section 3 Troubleshooting
To reduce the risk of electric shock, fire, explosion, serious injury or death:
• Disconnect electric power to the tumbler before servicing.
• Close gas shut-off valve to gas tumbler before servicing.
• Close steam valve to steam tumbler before servicing.
• Never start the tumbler with any guards/panels removed.
• Whenever ground wires are removed during servicing, these ground wires must be
reconnected to ensure that the tumbler is properly grounded.
W002
WARNING
18. CYLINDER TURNS, BUT WILL NOT HEAT
24 VOLTS PRESENT AT
OUTPUT TERMINAL OF
TEMPERATURE CONTROL BOARD
AIRFLOW SWITCH
STAYS OPEN
FAN TURNING COUNTER-
CLOCKWISE AS VIEWED
FROM THE FRONT
YES
NO
REFER TO INSTALLATION MANUAL
FOR MAKEUP AIR AND EXHAUST DUCT
REQUIREMENTS
YES
YES
NO
NO
REVERSE ANY TWO OF THE
ELECTRICAL SERVICE LEADS AT
THE FAN MOTOR CONTACTOR.
GAS SHUT-OFF
VALVE OPEN
OPEN GAS SHUT-OFF VALVE
CHECK FOR BROKEN OR LOOSE
WIRE TO IGNITION CONTROL
24 VOLTS PRESENT AT
INPUT TERMINAL OF
TEMPERATURE CONTROL BOARD
YES
NO
REPLACE THERMISTOR OR
TEMPERATURE CONTROL BOARD
24 VOLTS PRESENT AT
TERMINAL 4 OF RELAY
YES
NO
CHECK FOR BROKEN OR LOOSE
WIRE TO MAIN THERMOSTAT
24 VOLTS PRESENT AT
TERMINAL 6 OF RELAY YES
NO
24 VOLTS PRESENT ACROSS COIL
TERMINALS OF RELAY
24 VOLTS PRESENT AT OUTPUT
TERMINAL OF STOVE HIGH LIMIT
THERMOSTAT
YES
NO
CHECK FOR BROKEN OR
LOOSE WIRE TO RELAY
24 VOLTS PRESENT AT INPUT
TERMINAL OF STOVE HIGH LIMIT
THERMOSTAT
YES
NO
REPLACE STOVE HIGH LIMIT
THERMOSTAT
YES
NO
(continued on following page)
REPLACE
RELAY
YES