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319 posts

Ultimate Geek
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# 251011 4-Jun-2019 20:41
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My son just contacted me with this query about his Rinnai flued gas heater.


"We have been using it a lot more since winter hit and and it has starting turning off quite a lot. It will run for twenty/thirty minutes or so and then shut off. You have to leave it for another five/ten minutes or so before it will start again. Is this something that can be fixed"


Its not a fault I have ever come across on this style of heater so advised him not to use it and call the experts. Went through the perils of carbon monoxide and "waking up dead" to emphasise this. I do know that the heat exchangers on this type can crack and leak.


Just this moment wondered if a blocked flue would cause it to shut down.


Hoping the experienced ones on here could offer advice.




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Uber Geek
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  # 2251625 4-Jun-2019 22:26
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Uber Geek
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  # 2251644 4-Jun-2019 22:47
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Been awhile since I have worked on one of those. Pretty sure that they dont have any flue blockage sensing system.

Most common cause of the cutouts would be failing thermocouple/ blocked pilot burner. Any decent gasfitter should be able to easily fix it.

Test the flue by holding a lit incense stick or similar to produce some smoke. Near the edge of the canopy ( level with the top of the burners) Check that the smoke gets sucked up the flue while the burners are operating.


319 posts

Ultimate Geek
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  # 2251646 4-Jun-2019 22:52
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Thanks for info

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Ultimate Geek
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  # 2251726 5-Jun-2019 07:57
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The ole flame thrower, I had one of these used to cut out had to blow on the flame to get the highest setting to work. Lost count of how many times I burnt off my eye brows . They are terrible heaters rip it out put in a heat pump or new heater

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