At Fixya.com, our trusted experts are meticulously vetted and possess extensive experience in their respective fields. Backed by a community of knowledgeable professionals, our platform ensures that the solutions provided are thoroughly researched and validated.
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
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Turn the power off at the breaker. Wait 10 minutes and turn it back on. That is the closes you get to a system reset, however, they say this
How do you reset a Goodman furnace?
Press and hold the red "Reset" button in the center of the rollout limit switch component. Hold the button for one to two seconds before releasing it..
This says Code 88 is a dirty filter. After the reset, pull the filter out and try again. If it runs, vacuum the filter and buy a new one next time you are passing Home Depot.
There is also an Error E8
E8
High Stage Pressure Switch Stuck Close at Start of Heating Cycle
There could be other problems but check and see if your igniter is not burnt out. Ours did that and tried to ignite for two days and then I found I had to change the igniter.
your limit switch is opening up, that causes constant fan. Check for flashing codes after flame shuts off and fan continues. Check airflow, filters, lack on return air for possible hi temp limit problems.
Hello, if the freon level is ok then there is a airflow problem, such as dirty air filter, dirty evaporator coil, or the blower motor is not pushing enough air across the evap coil.
I would probably use a furnace for the correct application. However some motors do have a reverse speed connection. Besides the blower speed taps,
capacitor wires and the nuetral wire. There are two wire sets that you can switch that can do this if your blower motor is equipped.
You might experience some airflow problems, probably a lack of airflow, if the furnace was installed
as an upflow model instead of a counterflow.
Fan purge for 30-45 seconds. During this time, a pressure switch is actuated by the running of the purge fan, proving the control board the purge fan is running.
After purge and purge prove, the hot surface ignition and or spark begins. After a few second delay, the gas valve will open. The control board then monitors for flame prove through another sensor located near the burners. If there is no flame within 3-5 seconds, the gas valve closes. It will repeat this process, usually 3 times, before it shuts the system down, which requires a power down of the system to reset.
I have seen trash get into the hose between the purge blower and the purge switch. But you could be having other problems.
You should NEVER attempt to relight manually this furnace. Serious burns could be the result. This furnace has an electronic ignition and should light by itself. If it does not light you may have a bad ignitor. These are usually around 30-50 US dollars.
Most likely the cause is that the furnace is firing too hot. When a furnace is installed and set up, the manifold gas pressure and fan speed has to be set by the technician so that the temperature rise through the furnace is a maximum of 50 deg F (i.e. if air enters the furnace at 68 deg F it come out no hotter than 118). The target temperature rise on any gas furnace is anywhere between 30 and 50 deg F. If the furnace runs too hot, either the manifold gas pressure must be turned down or the fan speed must be turned up to keep in this range.
×