Question about Rheem Paloma Tankless Water Heaters PTG-74PVN Tankless RTG-74PVN

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The unit starts for a few sec then shuts down.ptg 74.

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A couple of things could be happening.

1. There needs to be more water flow at the faucet, a minimum of .75 gallons per minute. Low flow and pressure balance faucets and aerators will not work well with tank-less water heaters. You need all the flow you can get.

2. The flame sensor in the main control unit is week, this is a common issue with your water heater.

Clean the unit to establish adequate water flow. Remove all faucet aerators and turn the faucets on to activate the unit. If you still get the on and off problem you need to call the company for a new flame sensor and/or control valve.

Posted on Sep 04, 2010

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Posted on Jan 02, 2017

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My unit is a paloma tankless model # PTG-74PVP its throwing error code C4 15 what does this mean? We believe its a flow problem because we hooked up an external pump, it starts out with full flow then...


Could be a restricted inlet pipe just as you suspected.
http://waterheatertimer.org/pdf/ErrorcodeTroubleshooting.pdf
error 15 is 'Boiling safety device'
"Check for closed water heater inlet valve or restrictions in cold water inlet pipe (must be fully open).
Check for clogged heat exchanger (scale buildup).
On commercial water heater, lower setpoint temperature below 180F at high altitude."

Open following links for Rheem tankless resources including Rheem chat and phone support:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
http://www.rheem.com/products/tankless_water_heaters/customer_support/

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Check your thermocoupling, because it seems like it isn't sensing the flame.

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Unit kicks off indicates C-2 and 11 . I go through the restarting process, it starts and then kicks off immediately and control starts flashing the C-2 and then 11. mod. # RTG-74PVN2


I had that happened twice to me by now.
Turns out to be dirty burner unit.

I got a "removal cleaning reinstallation" bulletin for the model 74 that I went by.
I basically took the burner unit apart cleaned it out (compressed air) and put it together again.
That did it.

johenkel

Apr 27, 2010 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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1 Answer

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1 Answer

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Aug 16, 2009 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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