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Recently purchased a Goodman gas furnace model GMVC950704CX. Continuous fan speed is preset to 30% of furnace maximum airflow which is 1500 CFM's. The furnace main board indicates that approx 500 CFM is being output by the furnace. The fan is on but running at a much slower speed approx 200 CFM's as measured by the installation contractor. A firmware update to the main board as well as trying different speed settings on the furnace has not resolved the problem. Last suggestion was to install a communicating thermostat that would override the main board control of the fan at a cost of $400. Not sure if this would even work. Any assistance would be greatly appreciated. Thanks

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I would contact goodmans tech guys for this they are on line or e-mail don't think a $ 400 Thermostat is the answer here

Posted on Mar 27, 2011

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