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You will need to test for where the power stops & check the fuses on each boiler for continuity. If you find any blown then replace the thermostat on that boiler along with the fuses. The thermostats are different rating for each boiler, don't mix them up. It's highly unusual for both boilers to fail at the same time. Occasionally one of the boiler elements can fail, there are 2 elements on each boiler, check them for continuity. If you have any boiler leaks then replace all the seals on that boiler, the steam one is the one most likely to leak. Buy your own seals using the old ones as samples from someone specialising in O ring supply. There are 5 seals on each boiler. Do not purchase rubber or silicone seals, only use Viton seals, they are high temperature.
You need to replace the boiler top that includes the elements. When one element has failed the other one stops as well if it is included in the circuit, it's the same as having a broken wire.
Test each element for the correct resistance. Check the thermal fuses for a circuit, they are held onto the top of the boiler with a screw down bracket. Check for a circuit through the thermostat.
There are several switches inside one of those if it is model KES100. Best to supply model number and say which switch it is, without looking I can think of 4 switches off the top of my head. I'm in New Zealand and have 3 of them in stock.
If the model is KES100 and coffee and steam are both at normal temperature then the problem is one of the following
1) The needle has come loose on the shaft. Solution; turn machine on and press needle back onto shaft in the usual position for full heat when the machine is on full heat.
2) The gas/liquid has escaped from the copper tubing to the gauge. Solution; fit a new gauge assembly.
Check the elements, there are 2 on the steam boiler, if 1 is open then that stops them. If your boiler comes complete that's fine, if you just get the element part then you must replace all the seals. I replace the seals on a new boiler anyway, originals are silicone and I upgrade to viton seals. Large one at the bottom, 3 small ones on side of base and one finger sized one at top steam pipe. Check switches for operation, sometimes they stick, if CRC does not fix them then replace. Make sure steam tap shuts off properly. The group head seal goes hard over time, replace while you are working on it if it is. Check thermostat has continuity when cold, on the side at the back of the boiler.
Check the 2 thermal fuses on the top of the boiler, if they are blown replace them and the thermostat. While you are at it replace the seals in the steam boiler, there are 5 of them in that boiler. If the fuses aren't blown check the element for continuity, sometimes one will fail.
If you mean the switch will not lock on then replace the switch and check for steam boiler leaks while you are there. Steam is the cause of most switch failures in this model.
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