Testing Assambled Thermal Fuse; Replacing Temperature Sensor - Dometic DS 200 Service Manual

- Unscrew screws from electrical cover, remove cover
- Slightly pressing the locking tab, lift out Fuzzy III printed circuit board from the
base board. (Fig. 49, 50)
Figure 49
- After finishing the actions, re-assembly is carried out in reverse order, paying
attention to the positioning of the wires and to the fitting of the aggregate unit
cover and the foot-frame
- In each case after disrupting the electrical circuit, test electrical insulation
resistance (with a 1000-V electrical insulation resistance meter.)
The insulation resistance is R
2.3.2.2.1. Testing assembled thermal fuse
The thermal fuse starts functioning in the event of the aggregates overheating, by
disrupting the electrical circuit of heating. It does not turn back on automatically,
in case of its break the appliance can be repaired by replacing the aggregate
(see 2.4.1), a component of which being the faultless thermal fuse fitted on the
boiler.
In the event of suspecting this error, the thermal fuse can be tested with a break-
detecting device, as follows:
- Disconnect the ends of the thermal fuse wire from the Fuzzy III PCB board
and from the heating element wires
- Connect break-detecting device on the free wire ends, test connection
- On the device, the faulty thermal fuse indicates a break, the faultless
indicates short circuit. Decide on the further procedure of repair depending on
the result of the test.

2.3.2.2.2. Replacing temperature sensor

- Pull off PCB connection of temperature sensor from the Fuzzy III panel
- Place refrigerator in upright position, open door
Figure 50
> 2Mohm
SZIG
16