Terry D Posted January 26, 2023 Report Share Posted January 26, 2023 Just installed a new Max-E-Therm 400 to replace an old one. This new one has only one LED, which blinks red as it tries to fire up. It keep cycling this startup attempt, but doesn't fire. I thought maybe it was insufficient natural gas supply so bumped it up from 7 inch to 10 inch water column (it is supposed to operate at 4 to 14 inch), measured in the supply line after the regulator. Does the gas valve have to be purged of air? My old one had several LED's and a red digital message display. All the troubleshooting guides refer to LED's for the pool button, the spa button, etc. This new one has only the one LED and the display is LCD like a calculator display. The old red LED digital display was easier to read but maybe not as reliable? Quote Link to comment Share on other sites More sharing options...
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