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Strange E31D4 fault – mystery
Customer called about an e31d4 we sold them. The temp coder was stuck at 150, also no heat.
Replaced the coder – temp can now be set
Still no heat – after lots of testing, traces this back to a dodgy ‘main heat relay’ ok of the coil pins had come loose. Glued back in place. Now we have heat.
Problem 3 – temperature sets fine, relay kicks in, gets to 80*C – stops
And that’s where I’m stuck, it’s cutting the power to the relay switch at a low temperature.
The thermo and the actual air temp parameter seems fine.
I just don’t get it.
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5 Replies
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Have you verified the high limit is functioning?
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Sounds like it’s working on the hold thermostat instead of the main. Check that all 3 elements are working, one bottom and two top. And that the timer is correct for cooking, not holding.
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You could also have a erratic fan motor switch.
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Thanks guys, as far as Incan tell the fan is working as it should.
Someone else mentioned to me about the holding thermostat. I can’t find any info on this in the service manual.
Will’ll double check all the elements are working tomorrow. Last I checked though they were all fine and I had power going to each.
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Be aware that the fan motor is just a shaded pole “C” frame. And the fan proofing switch (if equipped) is no more than a sail on a micro-switch of the fan motor cooling. Any air restriction or motor loss of speed will effect the switch function. Plugs and micro switch problems were common on the old analog version.
The digital versions like you have have been simplified were the controller does it all. But, the controller has to see the right voltage and be programmed correctly. Start by actually measuring the line voltage coming into the machine. Then check the low voltage tap on the transformer to be correct for your input voltage. Now check the transformer output voltage. Once that is done you can confirm programming. Oh, make sure to check the thermistor with a ohm meter. wiggle the wire around and monitor it by using a ice cube and a heat gun to see if it is stable. How clean was the controller compartment? Plug connections have always been a problem with digital equipment.
BTW, preheat should take the oven to 150C. Holding/min temp is 60C but can be programmed higher. Like the 80 you see. You may want to check the encoder. I’m not certain of it’s design. If anyone has a old one, I’d like to dissect it.
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