Lang ECCO-AP, Service Manual

Page: 37 / 73

36
TROUBLESHOOTING ECCO-AP
HINT: Confirm that all Circuit Breakers are in the “ON” position.
NO MOTOR
PROBABLE CAUSE CORRECTIVE ACTION
Defective Fan Switch
!
Verify that Fan switch is in “ON” position (In pulse position motor
will only cycle when oven calls for heat).
Defective Fuses
!
Check fuses for normal operation.
Defective Transformer
!
Check transformer for normal operation.
Defective Motor Relay
!
Check motor relay for normal operation. (24VAC 35
Ω
)
Defective Door Switch
!
Check door switch for normal operation.
Defective Motor
!
Check motor for normal operation. (P1-T9 low, P1-T7/T4 high)
NO HEAT
PROBABLE CAUSE CORRECTIVE ACTION
Defective Elements
!
Check that elements are getting power.
!
Confirm that Elements are working correctly. (See Technical Data)
Defective Transformer
!
Check transformer for normal operation.
!
Replace if necessary.
Defective Probe
!
Confirm that probe has proper resistance for the correct temp. (See
Technical Data)
Defective Heat Contactor
!
Confirm that Contactor is getting correct voltage.
!
Confirm that Contactor is operating properly. (24VAC 6
Ω
)
Defective Circuit board
!
Confirm that Heat Call light is on.
If no light is detected:
!
Check 12-position switch for normal operation. (See Technical Data)
If light is detected:
!
Check for 24VAC across heat output and “D” on 12 Pole terminal.
If voltage is not present:
!
Replace Circuit board.
If voltage is present:
!
Check over temperature thermostat for proper operation.
!
Check door switch for normal operation.