TurboChef Technologies Residential Single and Double Wall Oven - Manual (Page 76)

6.12 TROUBLESHOOTING
Heater Element, Speedcook Oven
Remove the wire connections and apply the probes
of an ohmmeter to each element’s respective termi-
nals. Th
e resistance should register 23 ohms for a
240 VAC unit and 17.0 ohms for a 208 VAC unit. If
extreme resistance (a variance above 10%) is detected
the element is faulty and needs to be replaced. En-
sure that the elements are at room temperature. Th
e
temperature of the elements will change the heater’s
resistance.
No Heat
1. Turn the CookWheel to Bake to activate the
preheating process. Th
e oven should
immediately make an audible ‘click’ when the
K9 relay closes. Wait 2-3 minutes and the oven
should heat noticeably. If no heat is present, pull
the oven out 11” (280 mm) to access the front
half of the upper electrical compartment.
2. Check the high limit switch. Press the red
button to reset the switch. If the oven is still not
heating, verify L1 (brown wires) and L2 (blue
wires) power is reaching the heater elements.
3. Turn the CookWheel to off , then disconnect the
three top brown wires from the high limit
switch and turn the CookWheel to Bake.
4. Apply the probes of the voltmeter to each of the
exposed female wire terminals and to ground. If
any of the terminals do not register 120 VAC,
check the breaker for a partial or full trip.
5. If the high limit switch is functioning
properly, apply one probe to any one of the
exposed female wire terminals and keep it there.
Apply the other probe to the three male
terminals on the high limit switch in sequence.
At least one of the three readings should register
240 VAC if the oven is heating (if this is the
case, go to Oven is Heating Up Very Slowly,
adjacent).
6. If none of the elements are receiving 240 VAC,
test the K9 relay, then the K1 and K8 relays
(Gen 1) or K1 and relay 14 on the relay board
(Gen 2) to verify both are receiving control
voltage from the control board.
Oven is Heating up Very Slowly
1. Turn the CookWheel to Bake to begin
preheating. Th e oven should immediately make
an audible ‘click’ when the K9 relay closes.
2. After 2-3 minutes, the oven should heat
noticeably. If little heat is present, pull the oven
11” (280 mm) from the cabinet to access the
front half of the upper electrical compartment.
NOTE: If the oven is heating, the K9 relay is
functioning because it is the single source of L2
voltage to all three elements. Th
erefore, testing
should begin with L1 voltage reaching the elements.
3. Turn the CookWheel to off , then disconnect the
three top brown wires from the high limit switch.
4. Turn the CookWheel to Bake.
5. Apply one probe of the voltmeter to any one of
the exposed female wire terminals and keep it
there. Apply the other probe to the three male
terminals on the high limit switch in sequence.
At least one of the three readings should register
240 VAC if the oven is heating at all.
6. If either of the primary elements is not receiving
240 VAC, test the K1 SSR to verify it is
receiving voltage from the control board to
activate.
7. If the preheat element is not receiving 240 VAC:
- Gen 1: Test the K8 relay for 24 VDC
from the control board to activate.
- Gen 2: Test relay 14 for 9 amps on
the relay board at RBJ10 and RBJ11.
Testing for Control Voltage to the K1 SSR
DANGER: A high-voltage capacitor is located
near this relay. Contact with the high-voltage
capacitor could result in serious injury or death.
1. Turn the CookWheel to Bake to begin the
preheat
cycle.
2. For Gen 1 ovens, apply the voltmeter
probes to P7-3 and P8-15, then to P7-3 and
P8-16 (on the control board). For Gen 2 ovens,
apply the voltmeter probes to RBJ22-7 and
RBJ22-1, RBJ22-7 and RBJ22-2 (on relay board).
Th
e voltage reading for each should be 24 VDC.
If 24 VDC is present, the relay is receiving
voltage.