APM 8512 TOC

[biggus1]

Hi
After 3 weeks of solving drips I know have a problem of the water is not heating. I have a brand new element but I don’t know if I have wired up the 4 pole TOC correctly. I tested the TOC with a multimeter and all poles read infinity with respect to each other at room temp. Is this right for this component? The TOC has white writing on on the bottom edge and my wiring is (for anybody who may be familiar with it) shown below.

Grey ————————————————-
– |
Grey | | White Black Grey
_ (element)

White

Any help appreciated – cheers

[biggus1]

Re: APM 8512 TOC

The wiring did not come out very well even after preview !

It should be:

———–grey——
—-
—-grey———white
—-
———-white——–

[Penguin45]

Re: APM 8512 TOC

It’s a combined temperature device. One circuit is an ntc circuit. This should give you a reading in kOhms on your meter. The other is is a straightforward make and break thermostat. It should be normally closed and therefore give a resitance reading of virtually zero ohms. The thick wires should be connected across the thermostat circuit, the thin ones to the high reistance circuit. If you look at where the wires go, the thermostat circuit should feed directly to the heater.

Penguin45.

[biggus1]

Re: APM 8512 TOC

Thanks penguin

You are of course correct! The ‘ntc’ or white terminals read about 5k but the grey ‘element’ terminals are reading open circuit at room temp. Maybe there lies the problem. I stupidly swapped these wires around (before reading your reply) so that the element wires were on the ntc terminals
<<>>

There was a burning smell and the house circuit breaker tripped. So I let it all calm down then returned the wires to where they were.
Reset the ciruit breaker and the machine seem ok.

I just hopeI havn’t damaged the electronic module in a moment of madness.

I will go for a new thermostat.

Many regards

[Author]

Posts