I’m not so sure the rm110 flashing code is what’s preventing the burner from firing. It might be though. I think that code flashes when the water softener tank is empty. That’s what that rm110 is that Karcher sells. Just fill the plastic water softener tank with some water to see if the code stops flashing. I wouldn’t think being out of water softener would prevent the burner from firing but they might have made it that way so you keep buying their RM 110.
I bought the rm110 and filled the tank. It still flashes
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The water softener sensor is probably just a float or magnet that completes the circuit. I would trace the wires back to the and just run a jumper wire between the two on the terminal block. That should take the water softener sensor out of the loop. The wire colors on mine softener are blue and brown but I’m not sure if yours will be the same colors. I had to do the exact same thing with my burner fuel level sensor. I’ll look at the wiring diagram and see if I can tell you which terminal ports to jump.
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If it were me I’d just remove the whole water softener system and it’s components or at least to narrow down the problem. If you look at the diagram below you’ll see where I highlighted two wires coming off the main terminal block. I then drew a red line which represents which two wires to hook together. That little block at the bottom is basically all of the components of the water softener system which include the Scale Inhibitor Sensor (B1), Low RM110 Level Light (H2), and the Scale Inhibitor Solenoid (Y2). Hooking those two wires together will bypass it. You could also just run a jumper from terminal block 12 to 4 if that’s easier. Just be sure to run it from the left side of 12 to the right side of 4 just in case each side of each block is insulated from each other which would mean either side is a separate terminal.
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We don’t know with 100% certainty the water softener system RM110 code is preventing the burner from firing but the above steps will let us know for sure. After bypassing it and, it still doesn’t fire, something else is causing it.
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Only info i could find so far is this
"G-day Mate.
Did you check if the igniters? they may be cloged up with ****. Unscrew the Sight glass on top of the boiler and run the machine (in cold or hot mode, doesn’t matter, as the ignitersare running all the time) and see if there are working, you should take them out anyway and give them a wipe with a rag as general maintenance item, and when you put them back in there should be about 5mm gap between them.
Less common reasons for the boiler to not work
- Faulty fuel solenoid valve, (You should hear a click sound about 5 - 10 seconds after you pull the trigger)
- Dirty fuel filter"
And something about dirty igniters plus a regap.
