Oven High Temperature Cutout (Htc); Resetting And Replacing The Htc - Bosch 500 Series Service Manual

58300000202181 ARA EN B
3. Hold the latch hook and slide the latch assembly back and a
little to the left to disengage it from the small support bracket
that sits directly behind it, then pull the latch forward.
Figure 18 Door latch/motor assembly and rear support bracket
4. Disconnect the wires.
5. Install the new latch/motor assembly, reconnecting the wires
and engaging the latch correctly with the latch support bracket.
6. Position the latch plate with the curved corners at the bottom,
and reinsert screws.
7. Restore power and test operation.

6.3 Oven High Temperature Cutout (HTC)

The resettable HTC is a normally closed 12VDC thermal switch that is
used to detect over-temperature conditions within the oven. It has a
connector that will interrupt the double line break (DLB) relay coil
voltage supply if the temperature reaches 185°C/365°F. When the
HTC switch opens, it breaks the line to the double line break (DLB)
relays, cutting off power to the elements.
With the latch plate removed, the HTC and the bracket it's mounted
on are visible to the left of the door latch/motor assembly. Figure 19
shows the HTC and bracket, but note that this view is looking from the
rear of the oven towards the front, beneath the top plenum.
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Novemb er 2018
Figure 19 HTC and mounting bracket

6.3.1 Resetting and Replacing the HTC

Always troubleshoot a tripped HTC to determine the underlying cause
of the interruption.
To reset the HTC...

The HTC switch should only be reset once or twice before being
replaced. The switch weakens each time it trips, so it will become
easier and easier for the switch to trip during high-temperature cycles
(i.e., Self-clean) if it has weakened over time.
To remove the HTC from the front, a right-angled screwdriver will be
needed....*
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Service Manual for Bosch 500 Series Built-in Wall Ovens
1. Remove power to the oven.
2. insert a flat blade screwdriver through one of the vent slots,
and depress the red reset button.
3. Restore power and test operation.
NOTICE
1. Remove power to the oven.
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