Tracing Element Faults - Fisher & Paykel OB30DDEPX1 Service Manual

Service Manual 547226: OB30

5.22 Tracing element faults

(Refer to Technical Overview Section 2.10-2.15 & 2.33)
PROCEDURE:
If the element does not turn off (element run-away)
Note: In normal operation the element will cycle (turn on & off) when the cavity
temperature has reached the set point.
switching noise of the element relay switch on the power module or using a current
meter.
1. Check the temperature sensor is reading the correct temperature. (refer to Section
5.23)
2. If the correct temperature is being read, isolate the supply and check that all the
elements are wired correctly and the element relay switches haven't short-circuited.
If the element does not heat up
Note: Before testing refer to Technical Overview Sections 2.10-2.15 & 2.33 to find out
which elements are used for each oven mode.
1. Check for a tripped thermal limiter. (refer to section 5.24)
2. Test the element operation in Technician Mode. (refer to Diagnostics Section 4.3)
3. If the element does not heat up in Technician Mode, test the resistance of the
element. The appropriate range of resistance for each element is given in Table 5.22
below. Replace the element if its resistance is outside the given range.
Element
Upper Inner
Upper Outer
4. Check the continuity of the element wiring back to the power module, including the
thermal limiters and the isolating relay.
Note: The isolating relay is only energized when an oven mode is selected.
5. If the wiring continuity is good, it is likely that the element is not faulty. (refer to
Symptom Procedure Checklist for further component tests)
Min Resistance (Ω Ω Ω Ω )
Lower
Fan
This can be detected by listening for the
Max Resistance (Ω Ω Ω Ω )
19
35
34
21
Table 5.22
40
December 2012
23
50
47
26