TurboChef C3/C, Service And Repair Manual

Page: 70 / 107

TurboChef Technologies, Inc. C Series
8-4
Heater Circuit Defective Messages
SELF TEST (STEST) WHILE COOKING
(WARMING UP)
CAUSE CORRECTIVE ACTION
THERMO OPEN THERMO OPEN HX Thermocouple amplifier
indicates open, (999
°
)."or"
CC Thermocouple amplifier
indicates open
1. Check Thermocouple connections on
I/O board connector (See I/O board
section for details) are not loose or
intermittently making contact with
mating connector.
2. Replace thermocouple.
HX RISE LOW HX RISE LOW 1) During the warm up cycle if a
14
°
F rise is not detected within 5
minutes of initial warm-up, then
the controller displays "HX RISE
LOW".
2) HX Temperature failed to rise
14
°
F in 30 seconds during the
self-test mode.
1. Check main internal circuit breaker.
If tripped, check the following
operation:
a) Interlock switches (Chapter 7)
b) Magnetron transformer (Page 9-8)
c) Hi-limit switch (See Figure 8-2)
2. Check heater fuse (F3). If fuse is
blown check for short to chassis on
all heater wires.
3. Check input current on heater
wires. (See Page 8-3)
4. Check operation of the heater
relay. (See Page 8-3)
5. Check blower operation (Page 8-9)
6. Check crimp connections on
controller.
7. Check HX Thermocouple.
LOW COOK TMP
(F3 LOW TEMP)
CC (Cooking Chamber)
temperature has dropped more
than 84
°
F (47
°
C) or more below
cook set point after 5 seconds or
more into cook cycle.
1. Check main internal circuit breaker.
If tripped, check the following
operation:
a) Interlock switches (Chapter 7)
b) Magnetron transformer (Page 9-8)
c) Hi-limit switch. See Figure 8-2.
2. Check blower operation. (Chapter
8-9)
3. Check CC Thermocouple circuitry.
4. Check Catalytic Converter (Page
8-2)
5. Check debris catcher (pepperoni
catcher). See Figure 8-2
6. Verify cooking chamber top air
nozzle holes are not clogged.
7. Open door and run blower from 0%
to 100% and verify blower is
working properly (Air pressure).
8. Verify oven software is greater
than Revision S (C3AD S).