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Cook Door
7-3
CIRCUIT BREAKER TRIP CHART
Component Possible Cause/Circuit Information
Magnetron transformer The
magnetron transformer will draw approximately 9 amps when
functioning properly. Check winding resistances (See Page 9-8).
A 3 Amp draw indicates the diode is defective.
Solid state contactor for
Magnetron (K4)
The coil operates on 24v dc. Solid state re
lays tend to fail closed.
Check with VOM meter. Reference Chapter 9 for troubleshooting.
Hot air heater element Use VOM meter.
240V element is 12 ohms / current is 20amps.
208V element is 9 ohms / current is 23 amps.
C3/C oven only: Check the 25 Amp fuse inline with the CB1 and the
heater. Reference Chapter 8
Solid state contactor (K5)
(K7) for hot air element
(See above for correct current draw.) The coil operates on 24v dc.
Solid state relays tend to Fail closed. Check with VOM meter.
High limit & K1 relay
(C3/AB and C3/C only)
High limit tripped (670°F/350°
C). Reset high limit switch with
screwdriver. Reference Page 8-4 for details
Door switch closure Check Switches with VOM meter. Reference Page 7-2 & Figure 7-
1
above.
Diode The magnetron transf
ormer will draw excessive current (greater than
15 amps), meaning the diode is shorted to ground. Reference Chpt.9
Figure 7-1
Table 7-1