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This dishwasher displays the error code for not heating. I ran the diagnostic program which confirmed the problem. The Wash pump works fine, and the heater gives a reading of 19 ohms. I swapped the control module with another known serviceable module. The same fault occurs. The reading on the heater is what I would normally expect. If its not the module or the heater or the cabling to the heater is there anything else I have missed. The readings on the thermostat on the heat pump are the same readings obtained from a new pump. Any prods in the right direction would be appreciated
are you sure about the heater ohm reading
using ohms law I = V/R gives 230/19 give heater current of 12 amps
am assuming your meter is a bit out
either way if you have a reading it cant be the heater
to be honest as far as I know you have covered both eventualities. Also on the heater are 2 ntc’s which I assume you have also checked. there are 2 relays that have to close to make the heater operate but have no tech to understand why yours are not. What I do not know is how the machine determines water flow to switch on the heater. Have you looked at the water height when its full ?Dave
Yes water height appears fine about 15mm above the filter assy. There is another item plugged into the sump with a couple of wires. I’m not sure what it is or what it does. This machine is one of the top of the range all singing and dancing with interior lights. I do get a reading on the ohms meter so would assume its serviceable. I wonder if this is what determines the water pressure to switch the heater on as you suggested! I might just fit a new one to rule it out.
Both the module and the heat pump changed. I ran the diagnostic program and E31 error displayed. I contacted Siemens Tech desk who stated that the fault was on the drying side. This machine has a metal container located just behind the module with an element and a fan which I believe drys the load. I don’t see how this would affect the wash cycle which has no heat? I will need to check the resistance on the drying element which should be 27-28 ohms.
This sounds like a zeolite model. The zeolite gets flooded and then fails to help heat the water on wash/dry. The early ones were modified to help reduce water into the zeolite. I’m no appliance care engineer, but had my own Siemens dishwasher do this twice in 2 years.
The first time App Care replaced all the zeolite components, the second time the dishwasher went to scrap.
It is not a cheap repair.
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