coleman evcon will not light off
Posted: Tue Feb 02, 2010 5:08 pm
coleman evcon 70 gas furnace- model #790e766..I realize this is a very old unit. It has been working great till this winter. It will not light off..
facts: ignitor lights up.(electric type)...ignitor box replaced last year...replaced ignitor ...replaced gas valve....getting 24+ volts at gas valve for about 3 seconds, then goes to zero.. ..transformer is working. ...induction fan works..checked all terminals and wires. i had a tech rep. out and he is puzzled. this problem was intermittent , but now seems like a permanant break...im pretty savy on troubleshooting , but im totally baffled ..any help would be appreciated..im cold! the sequence works ok, but will not lite off.
facts: ignitor lights up.(electric type)...ignitor box replaced last year...replaced ignitor ...replaced gas valve....getting 24+ volts at gas valve for about 3 seconds, then goes to zero.. ..transformer is working. ...induction fan works..checked all terminals and wires. i had a tech rep. out and he is puzzled. this problem was intermittent , but now seems like a permanant break...im pretty savy on troubleshooting , but im totally baffled ..any help would be appreciated..im cold! the sequence works ok, but will not lite off.