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I have a 1 1/2 year old Polaris 50 gallon Natural gas heater (130,000 BTU model). Everything was working perfectly until about a week ago. Now, whenever it ignites, there are a few (ranging from 1 to 5) loud thumping noises before the ignition. There are no error codes, it ignites and heats fine and there are no other noises. There haven't been any changes to the gas, exhaust, etc... It just started happening one day. Our natural gas line is 2# with a reg, if that makes any difference. In that year and 1/2, it has been flushed a couple times and each time, there is no visible sediment coming out.
I've tried everything that I could think of...loose venting, pipes banging, flushing, took off the air intake and fired the tank (in which case the noise was a bit quieter, but still there)...
I'm not opposed to calling someone in to take a look and troubleshoot, but I would prefer to cover off any other simple possibilities myself if I could.
Thanks for your time...Any help is appreciated.