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When this tape is on it continues to run perfectly. Exhaust temp is much higher as well

It really runs well when I cover part of the intake

The pressure is higher than most houses. But not by more than 1-2 psi. All of my furnaces and water heater and this pool heater have been on it for years with no issues. It’s still turning on and off every 30 seconds. Only stay on it I cover the intake like it shows in this pic

So just went out to start it up to see the fenwal diagnostic light and now igniting with heavy gas odor and then shutting off. Over and over. No codes fenwal not blinking as it hasn’t gone into service mode yet. I have a ton of natural gas. Plus I own the gas well and have plenty of gas. So...

So this heater started having issues this summer. I turn the pool button on,cycles 3 times trying to light then turns off. Says service heater with no lights on the back indicating any issues. I have replace flu stack, thermistor twice, the high limit switch, ceramic igniter twice, the...