Dayton fuel trimmer 3e438a fan limit control

limited info generic answer ---when last tune up --nozzle clogging--filter clogging --fire safety --high limit--fan sensor --dirty or failing ---vent

check safety circuit sail switch for fan and ignitor glows and check for cobwebs in burners

The typical 'summer/winter' switch is an added switch associated with OLD heating systems back in the 50's and 60's before central air conditioning became common in homes. I doubt that your new furnace had one installed because you can accomplish the same thing by switching the fan on at the thermostat sub-base. That is, of course, providing you have a subbase with 'fan-on-auto' on it.

Check to see if fan setting is summer or winter.

Hello, if you are referring to,the blower motor then most likely the relay on tne integrated contol board is malfunctioning. Unfortunatly the whole board must be replaced in this case.

Hi,

Sounds like the blower motor is bad and then the unit is kicking off on high limit....

Probably nothing you can do with out getting a new motor to replace the bad one...

heatman101

It sounds to me like your draft motor is probably shuttimg off on thermal overload. They will get to hot and shut down until the motor cools down then run again.But by that time it's caused other trouble so I think you need to replace the motor first and then see what other problems it has caused.I hope this helps you and thanks.

Hi blow heater out with air line flame sensor could be dirty check out pressure switch jump this out see if it lights

Hi,
Yes, it can be set on concrete blocks or anything non-flammable.
Also make sure that you do not run it if you are working with flammable gases or materials. I don't believe that that heater is sealed combustion.
Make sure also that you have correct venting so you don't wake up dead...
If you can take good precaution then go for it...

Heatman101

chech the air filter is clean and the fan limit switch look to change fan limit