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Hiel furnace

JOHN CILLEY
JOHN CILLEY Member Posts: 1
in THE MAIN WALL
I HAVE A CUSTOMER WITH A HIEL FURNACE THATS ABOUT 14 YEARS OLD. THE UNIT IS IN MINT CONDITION WITH S.S. STEEL BURNERS AND THE EXCHANGER IS CLEAN ENOUGH TO EAT OFF OF.
HIS PROBLEM IS INTERMITENT. HE WILL WAKE UP TO A FURNACE THAT IS RUNNING BUT THE BLOWER IS NOT CIRCULATING AIR. AND HE CLAIMS HE NEEDS TO TURN HIS TSTAT UP HIGHER TO GET THE FAN TURN ON. I KNOW THE TSTAT HAS NOTHING TO DO WITH IT SENSE ITS A REGULAR T 87 F WITH NO FAN SWITCH INVOLVED. I CHANGES THE FAN LIMIT SWITCH AND IT RAN FINE FOR ABOUT A DAY THEN IT STARTED TO DO IT AGAIN. IN MY EXPERENSE I HAVE NEVER SEEN A RELAY BREAK DOWN INTERMITENTLY .IT EITHER WORKS OR IT DOESNT. THE NEXT THOUGHT WAS THE BLOWER MOTOR HAS A BAD SPOT IN IT. BUT I HAVE ALWAYS EXPERENCED THAT THE MOTOR WOULD NEED TO BE ROTATED BY HAND IN ORDER FOR IT TO GET AWAY FROM THIS DEAD SPOT. IS THERE ANY WAY TO CHECK FOR A DEAD SPOT ON THE MOTOR? HAS ANY ONE RUN INTO THIS SITUATION BEFORE? ANY HELP WOULD BE GREATLY APPRICIATED, SENSE I REALY DON'T WONT TO SPEND THE NIGHT AT THIS HOUSE TO FIND THE PROBLEM.

Comments

  • Jason_25
    Jason_25 Member Posts: 22


    If it's a smartvalve I would check gas valve when furnace is running move wires around right at valve and see if it fails, some had bad solder joint right at wire connection.
  • Empire_2
    Empire_2 Member Posts: 2,340
    Heil 14 years old...

    Mod # would help and remember that if the switch you replaced is just a limit made by cam stat and the fan timer is a white or black box, you may be tripping on limit prematurely. This will kill the voltage to the timer and cycle as you described. Relays go bad all the time. Check and replace because you never know if the contacts are pitted and it can fool you especially when the motor goes sometimes on, sometimes nothing....

    My thoughts

    Mike T.
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