Takagi JR error code 12

Dana, I'd have to ask my husband about which switch it was and he's not home right now. If I think of it, I'll reply back once he gets back.
 
Re: error code 12

I am having the same issue at my place
tenants have reset heater 2x in last 2 days
it keeps shutting down with error code 12
I am sending my plumber over tomorrow to clean the flame sensor (soft scouring pad, not sandpaper)(although I called Takagi and they said 100 grit SP was OK)
I will also have him check the water filter
what else would be good to do?
the manual mentions venting system, burner, and heat exchanger
I assume there are protocols for how to check these, but not in the manual
do they exist anywhere? I'd like my plumber to be clear on what to do
he is an experienced (30+ year) pro, but he is not a TK tech
thanks for any help,
Rolf in MA
 
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