Question about Rinnai Unvented Gas Zone Heater. 99% fuel efficient: Blower with Thermostat

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Little spark to start my unvented 8 year old Rinnai. Use match.

It lights but have to prop a stick to hold the pilot lightopen. Could it be the thermal couple?
Bobbye

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Yes - most likely thermocouple, or if the pilot has an orange tip, it will not heat the thermocouple enough to keep the valve energised. Try a blast with canned air or contact cleaner down the tube, not 100psi air compressor.
If that doesn't help, time to ring a gasfitter.

Posted on Jul 17, 2009

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Bob, there are several reasons for what you described:

The gas line shutoff valve is turned OFF. The unit is not getting gas for ignition.
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The above are the top 3 things that usually cause what you have described. Troubleshoot those and you will more than likely solve the problem.

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The thing with these is over the summer months when they are not in use they get dust inside the ODS safety pilot. When that dust gets in there it cuts down on the oxygen inside and the safety simply shuts down because it was designed to do that. What you need to do is flush the pilot and allow it to dry. I use a product caller but you could use shop air or even a soda straw to blow out the pilot. I used to sell these thermocouples for ODS systems and they are not cheap. Most times they do not solve the problem either because the pilot is dusty. A brand new one won't solve your problem and a cheaper thermocouple don't work on these. More HERE


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1 Answer

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Possibly A bad thermocoupler. It is the part that looks like a stiff solid copper wire with on end sticking in the flame of the pilot light and is a safety feature if the pilot goes out it starts to cool and the resistance changes back you the module and the module shuts the gas off. I have seen these go intermediately faulty in waterheaters and do just what you described.

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