How to test this queen coffee maker heating element
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Queen coffee CQ MN-2 Heating element
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Re: Queen coffee CQ MN-2 Heating element
The heater connections are at the back of the can.
The front of the can has what looks like two thermal switches. One is for temperature regulation and the other is a safety-limit (klixon). I might be wrong because I don't know the difference between AUTO/MANUAL operation of the heater, maybe it has two running temperatures.
I would measure resistance across the heating element, and to the can housing to see if the heater is not open-circuit or shorting to ground.
The two thermal switches should be normally-closed I think. The one on the right might have a reset button you can see, try push it down. But if it tripped then the left one is for temperature regulation and might be stuck on, so another problem.
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Re: Queen coffee CQ MN-2 Heating element
Originally posted by redwire View PostThe heater connections are at the back of the can.
The front of the can has what looks like two thermal switches. One is for temperature regulation and the other is a safety-limit (klixon). I might be wrong because I don't know the difference between AUTO/MANUAL operation of the heater, maybe it has two running temperatures.
I would measure resistance across the heating element, and to the can housing to see if the heater is not open-circuit or shorting to ground.
The two thermal switches should be normally-closed I think. The one on the right might have a reset button you can see, try push it down. But if it tripped then the left one is for temperature regulation and might be stuck on, so another problem.
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Re: Queen coffee CQ MN-2 Heating element
Originally posted by bohaboha View PostI get 26.1 ohms on all contacts if I have measured correctly
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Re: Queen coffee CQ MN-2 Heating element
Originally posted by CapLeaker View PostOn what? The heating element or the high limit temperature trip switch? If you do get continuity on both, things are good and it should work, unless one of the on / off switches or fuse is bad.
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Re: Queen coffee CQ MN-2 Heating element
Originally posted by R_J View PostHere is the boiler, check the resistance of the element, The thermal cutouts should read 0Ω.
What is the problem you are having with the machine?
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Re: Queen coffee CQ MN-2 Heating element
Originally posted by bohaboha View Postfirst it didn't work then on test it just worked but then nothing and I don't know what to look for plus I can't find a fuse anywhere
If the lights S1 or S2 light when the switch is turned ON, but the S3 brew light does not come on, check the micro switch B3, check that it is being activated. I believe the micro switch is activated by the water level, so if there is no water in the top reservoir, the boiler and the brew light will not work.Last edited by R_J; 07-20-2022, 08:18 AM.
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Re: Queen coffee CQ MN-2 Heating element
Originally posted by R_J View PostThere are two separate warming plates, do either of them work? There are also three lights, do any of them work? If none of the lights work and neither of the warming plates get warm, I suspect the main switch or the wiring going to the switch.
If the lights S1 or S2 light when the switch is turned ON, but the S3 brew light does not come on, check the micro switch B3, check that it is being activated. I believe the micro switch is activated by the water level, so if there is no water in the top reservoir, the boiler and the brew light will not work.
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Re: Queen coffee CQ MN-2 Heating element
Yes I think the water level switch or float is not working.
I am not sure how the water does not leak to the microswitch, there must be a seal or gasket. Something mechanical that might jam or get stuck.
pic from parts catalogue https://cdn.badcaps-static.com/pdfs/...5e66bfbe58.pdf
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Re: Queen coffee CQ MN-2 Heating element
Originally posted by redwire View PostYes I think the water level switch or float is not working.
I am not sure how the water does not leak to the microswitch, there must be a seal or gasket. Something mechanical that might jam or get stuck.
pic from parts catalogue https://cdn.badcaps-static.com/pdfs/...5e66bfbe58.pdf
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