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Old 04-10-2020, 18:45   #1
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Webasto Hydronic Heater Thermo 90

I am having issues with my Webasto hydronic heater. Its a Thermo 90. I was replacing the burn tube and in the process I broke the flame sensor. I ordered a replacement and installed it. Install seems pretty straight forward, but I am getting a fault of 5 flashes. That is either wiring, or the flame sensor. I removed the flame sensor and tested it with my multi meter. I get a reading of 3.4 ohms which is within range. So that seems to test ok. I removed the wiring pins and reinstalled. I tried reversing the wires to the pins (they are both grey). I have taken it apart and put it back together a couple of time in the process and no matter what I get five flashes on the warning light. I am running out of ideas on what to test. Any thoughts?
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Old 07-10-2020, 06:55   #2
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Re: Webasto Hydronic Heater Thermo 90

I'm sorry that you have not received a knowledgeable reply. It will take someone with very specific knowledge, I think.

It's a very long shot, because getting a defective part happens, but not often, but put a propane torch to the flame sensor and see that the resistance changes.

What does customer support say about the five flashes? Is that a coded error?

Is there voltage coming to the flame sensor?

Sorry I can't do better.
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Old 09-10-2020, 22:27   #3
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Re: Webasto Hydronic Heater Thermo 90

Five flashes is not the code. Itís the flashes after the five flashes. I remember something about the unit locking you out after so many tries.
Anything on line ? Iíll see if I can find more.
What else is on the tag.
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Old 09-10-2020, 22:50   #4
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Re: Webasto Hydronic Heater Thermo 90

Hi. The workshop manual is online at Sure Marine Services and Butler Technik.
Butler Technik has a big web site and are very helpful .
You donít need the stuff to link a computer to your heater .
Check every wire connection. What timer do you have.
The trouble shooting section tells you how to test parts.
Please let me know how it goes.
Happy trails to you.
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