rinnai code 12

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rinnai code 12

Author: larry p (FL)

i have a 10 year old rinnai ru75 ep. recently it started intermittenly giving me a code 12. cut power off and on and sometimes that solves problem . i have had 2 different rinnai approved techs out . first guy cleaned burner plate,fan, and finned plate . worked for 30 min. second guy replaces flame rod and gas regulator inside unit . i have replaced ignition module and switched out electrical breakers and switches . latest trick is to turn on hot water and wait for code . while leaving hot water faucet on i cut power supply off and on and that seems to be a temporary solution . last guy said he would be throwing darts at it trying to fix it . cleaned water filter under unit . havent flushed lines yet due to no clean out valves yet . anybody have same problem ? any suggestions would be appreciated ! thanks !

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Re: rinnai code 12
Author: steve (CA) Have you seen a troubleshooting checklist for Rinnai? [www.rinnai.us]
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Re: rinnai code 12
Author: larry p (FL) i have and still no sucess. does anybod have ideas as to what is wrong ? now the unit will code 12 and after cutting pwer 2/3 times it stays on with no code. i cant keep paying techs to come out and not fix it . thanks !
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Re: rinnai code 12
Author: Plumberpalmer (MA) Has anyone checked the gas pressure with a manometer while unit is running and all other appliances are running?
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Re: rinnai code 12
Author: larry p (FL) no other gas appliances . tankless heater the only gas user . presssure was 11.5 10.5. if flame rod wire is ground due to wear would i see arc with cover off and nighttime ? thank you
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Re: rinnai code 12
Author: Plumberpalmer (MA) Is this LP gas or natural ? If it is natural it is to high
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Re: rinnai code 12
Author: larry p (FL) lp gas
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Re: rinnai code 12
Author: Wheelchair (IL) A defective gas regulator on your LP Tank? Best Wishes
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Thanks for the response!
Author: larry p (FL) had it checked when they filled up tank . thanks for the response ! Edited 1 times.
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