Zanussi ZWD71460NW Dryer not heating

[Twoten]

The above machine PNC914603903/01 is not heating when tumble drying.

When set on a dry cycle the drain pump runs and the inlet valve operates.
The dryer fan comes on with power to the dryer element for about 5 seconds.
Then the fan and power to the element cuts out for about a send followed by the fan running, the inlet valve and drain pump running but no power to the element.

The dryer element tests OK, the thermostats are not O/C. What resistance should I expect across the NTC?

There’s no obvious signs of damage to the PCB.

Any thoughts on this?

[alster]

Re: Zanussi ZWD71460NW Dryer not heating

Haven’t looked up the exact model but check for earth fault on dryer element or wires broken on thermistor at the bottom of the condenser.

[Twoten]

Re: Zanussi ZWD71460NW Dryer not heating

alster wrote:Haven’t looked up the exact model but check for earth fault on dryer element or wires broken on thermistor at the bottom of the condenser.

There were no insulation faults on the machine.
The only NTC I could find was the one on the front of the heater/fan housing.
Looking at the parts listing there’s only one NTC listed.

The parts list shows a humidity sensor on the drawing (1328301013) but says “This part is currently not available.” and I don’t recollect seeing one.
Is there definitely one at the bottom of the condenser on this machine?

[bazza500]

Re: Zanussi ZWD71460NW Dryer not heating

Any error codes in the memory?

[electrofix]

Re: Zanussi ZWD71460NW Dryer not heating

list two temp probes for dryer

132 83 01-01 / 3
and
807 48 73-01 / 2

both listed at 5k ohms 25 degrees C

Dave

[Twoten]

Re: Zanussi ZWD71460NW Dryer not heating

bazza500 wrote:Any error codes in the memory?

How do I access the memory on this machine?

electrofix wrote:list two temp probes for dryer
132 83 01-01 / 3
and
807 48 73-01 / 2
both listed at 5k ohms 25 degrees C
Dave

I was getting a reading of 4.8k at ambient on the 8074873012 mounted on the heater housing. The 132 83 01-01 / 3 said not available with Distripart but I see it’s in stock with Connect so I can order it from there.
Where is this mounted? I didn’t notice it when I looked at the machine.

Is there a test program for this machine?

[electrofix]

Re: Zanussi ZWD71460NW Dryer not heating

have pm’ed you bits of the manual

[Twoten]

Re: Zanussi ZWD71460NW Dryer not heating

electrofix wrote:have pm’ed you bits of the manual

Thanks Dave.

[Twoten]

Re: Zanussi ZWD71460NW Dryer not heating

Update on this:
I found the NTC wires were broken at the retaining clip on the heater box.
I ordered and fitted the modified wiring harness.
Now when I turn the machine onI get an E90 error.
I understand this is normally a communication error between the boards so I removed the connecting wires and checked fo continuity, tightened the connectors and refitted.
Still E90.
Further testing seems to give me the E90 error when the NTC is connected.
If I run diagnostics the display shows E9E.
I’ve double checked the NTC which is at about 5k?.

[Author]

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