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This could be due to either an open safety switch such as a rollout or high limit, or the relay could be welded inside the control board constantly sending 120 volts to the blower motor. A less common cause could be a bad thermostat which can be verified by removing the face plate. If the blower stops, then the thermostat will need to be replaced.
have you changed t-stat? if so you need to increase the heat anticipator. if you have a fan limit switch, the setting may need adjusting. Thay will change with age
the glass is there as a service tool to veiw pilot and flame or relite just get a peice of sheet metal and cover hole with it ,it will work short term or long term
You should have 3 wires going to the gas valve - MV(mainvalve), PV(pilot valve) and MV/PV (or Common). Make sure all of these are properly wired and tight.
You also may have a dirty FLAME SENSOR on your pilot/ignitor assembly. You may need to remove the pilot tube and the pilot assembly to clean the sensor with sandpaper.
Be careful not to damage any parts while cleaning them. Be careful not to crossthread the gas line when re-installing it.
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