Do you mean the gas? There is no fan.
The first time when we turned this on, we needed to shut everything off (except for the gas) including the power at the breaker. There is an internal safety device that needs to be reset before it will operate. Then turn it all back on in this order, the breaker, then the unit. That worked for us when we were having an issue with the unit.
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check gas pressure overheating
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