TurboChef ENCORE Service Manual page 60

38 TROUblESHOOTING
reset and determine why
it tripped – excess grease
buildup, etc. The reset
button is on the back panel
near the power cord.
Is the solid state relay defective?
1. Leave the 4-pin control wiring
connected.
2. Set the meter to DCV.
3. In Test Mode, turn on the top
(H1) heater (page 20).
4. on K5, check between b(-) white
to ground. If the signal goes from
24 VDC to 0.VDC, then the
signal is good and the SSr is
defective.
5. repeat steps 3-4 for the bottom
(H2) heater on K4 between A(-)
white to ground.
SSr is defective
replace the solid state
relay.
Troubleshooting:
F2: lOW TEMP (Cook Temperature low)
Is the high-limit
YES
thermostat tripped?
replace the
defective heater.
Is wiring from the solid state relay
to the I/o control board oK?
Check wires at the 4-pin connector
on the SSr:
(A + - + - b)
1 2 3 4
SSr oK
(See page 48 for schematic.)
Correct wiring.
Is the H1 or H2 heater defective?
No
1. Isolate the heater circuits by
disconnecting them from the
high-limit switch.
2. The top (H1) heater should
have a resistance of 13 ohms
at room temperature.
3. The bottom (H2) heater
Heater is
should have a resistance of
defective
14.4 ohms at room
temperature.
See page 20, sections "Top
Heater oK
Heater Test" and "bottom
Heater Test" for Test Mode
instructions.
No YES
Is each rTD functioning
properly? (See page 23,
section "rTD - Top and
bottom Testing Procedure"
for testing instructions.)
YES No
Ensure wiring is
replace the correct. If neces-
control board. sary, replace the
defective rTD.