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I have an Atwood tankless water heater (model OD-5001CW) with a strange problem.  All of a sudden, it quit heating water.  With water flowing, I could hear the igniter clicking but it didn’t ignite.  In troubleshooting.  I took the pressure regulator off the hose.  Still nothing.  I then opened the pressure relief valve on the water heater and it instantly lit.  Pressure relief valve closed, no ignition.  Pressure relief valve open, ignites immediately.  Any thoughts as to next steps/resolution would be appreciated.

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If this uses pressure transducers inlet and outlet to prove flow that could account for this  

Edited by bm02tj

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On 11/16/2022 at 5:45 PM, bm02tj said:

If this uses pressure transducers inlet and outlet to prove flow that could account for this  

Right!

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