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Lets find where the fan wires connect to board at HEAT and L2. See if we are getting power to motor on call for heat after burners light
On call for heat we should get 230 volts between L2 and HEAT terminals where wires connect to board 30 seconds after burners ignite
Let me know and we will go from here
Lets keep an eye on it for awhile before closing question.Make sure motor is nor overheating and stopping.
The troubleshooting chart does not show anything for solid on.That is usually and indication we have power.If an over temp cuts it off light should blink 3 times and pause
If blower stops again, feel and see if it is hot. If so first I would check the capacitor to make sure it is not weak causing blower to overheat