Vulcan-Hart 3-130, Service Manual

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5 – 4
SECTION 5 - TROUBLESHOOTING - 3-STAGE
5.6 DIAGNOSTIC TABLES
FURNACE SETUP COMMON ERRORS
Symptom Possible Setup Error
Display blank No line voltage
Power switch failure
J8 disconnected
No Setup functions after ENTER Furnace was in start cycle at power down
Muffle does not heat after power up Not in start cycle
Door switch not closed
No door movement after switch is pressed Furnace is in TEST mode
Motor connector J5 loose
POWER SUPPLY VOLTAGES
Output Voltage Output Test Input Test
Voltage Tolerance Ripple At Ripple At
+12V +/-350mV 0.02Vac PT1 & PT4 3Vac PT1 & PT4
+ 5V* +/-250mV 0.02Vac U3-3 3Vac U3-1
* Note: +5VDC is dependent on the presents of the 12VDC, U3 on the main PC Board regulates the +5VDC.