New Tankless gas water heater has no flame


New Tankless gas water heater, no flame. Gas is on. New battery. All pressures OK. I see the ignition sparks. I also hear the thunk sound of gas valve solenoid opening. But no flame. I tried blowing and sucking on the gas inlet with my mouth and manually pull on the micro switch, the solenoid valve tries to open and makes the clunk noise but I can’t blow air through. In the old unit I could blow air through the gas inlet using my mouth after manually pulling on the micro switch. How to test and fix? via /r/DIY

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