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Upper Heater Ceramic
Ceramic Heater
4. To gain better access to components, remove
the wires that plug into the large relays on the
Relay Board.
(See
Relay Board
.)
Cut the wire tie
that the Smart Board CN103 wire harness (See
Smart Board
.) is routed through.
5. Set oven for Speedcook, Upper Lamp power
level at 10. (See
Operating Modes
for set up
instructions.)
6. Start Speedcook cycle. While unit is running,
check resistance between the 2 terminals
on Relay Board RY9.
Note:
This step requires
checking resistance of relay contacts while the
unit is running. The upper heater ceramic relay
wires must
not be
connected to the relay when
making this check.
• If resistance is in
fi
nite, the upper heater
ceramic relay is not closing. (See
Relay
Board
, troubleshooting step 2.)
• If resistance is approximately 0
Ω
, go to step 7.
7. Check resistance between the single wire (brown
wire) that connects to Relay Board RY9 and the
output of the Primary Interlock Switch (brown
and red wires).
• If resistance is approximately 20
Ω
, see
Primary Interlock Switch
,
troubleshooting
step 4.
• If resistance is in
fi
nite, problem is with:
◊
Upper Heater Ceramic, or
◊
Upper Heaters TCO, or
◊
Wiring between the Upper Heater Ceramic
and Upper Heaters TCO, or
◊
Wiring between the Primary Interlock
Switch and the Upper Heaters TCO, or
◊
Wiring between Upper Heater Ceramic
and the connector that connects to RY9.
8. Disconnect Relay Board RY9 connector. Does
heater stay on?
• If no, the Relay Board RY9 is stuck on. (See
Relay Board
,
troubleshooting section.)
• If yes, the neutral wire to heater is shorted
to ground.
• Location
(See
Top View
.)
• 700
Watts
• Approximately 5.8 Amps
• Approximately
20
Ω
• Paired with Upper Heater Halogen to make up
the Upper Heater Assembly.
• Upper Heater Ceramic and Upper Heater
Halogen always cycle together except in test
mode.
• For operating algorithms, see Upper Heater
Ceramic in the
Load Algorithm Chart
.
• Disassembly.
(See
Upper Heater Assembly
Removal
.)
Troubleshooting
1. Does the display operate properly?
• If no, see
VFD Board
, troubleshooting step 1.
• If yes, go to step 2.
2. Is Upper Heater Ceramic staying on all the time
or not coming on?
• If heater is staying on, go to step 8.
• If heater is not coming on, go to step 3.
3. Pivot the Control Panel Assembly out from the
oven. (See
Control Panel Removal
.)
(
Continued Next Page
)