Check the sensing bulb for any obstraction, make sure is directly over the flame, check the gas line for properly installed, check any safety switches it may have such as oil drain valve switch controlled by the oil drain valve. If it has an exhaust blower, it may have to get up to a certain speed before the flame will come on. This would be a vacuum type switch. If it has a pilot light that burns all the time, it probably has a thermocouple which the pilot light heeps hot. This could also be the problem and need replaced. Hope this may help you; Regards, VOTIT
Yes you should be able to jump out the t-stat and that vat should fire up. The hi limit is so that the unit does not over heat.Yes you should be able to jump out the t-stat and that vat should fire up. The hi limit is so that the unit does not over heat.
Answers & Comments
Check the sensing bulb for any obstraction, make sure is directly over the flame, check the gas line for properly installed, check any safety switches it may have such as oil drain valve switch controlled by the oil drain valve. If it has an exhaust blower, it may have to get up to a certain speed before the flame will come on. This would be a vacuum type switch. If it has a pilot light that burns all the time, it probably has a thermocouple which the pilot light heeps hot. This could also be the problem and need replaced. Hope this may help you; Regards, VOTIT
Are there three separate t-stats with this unit and if so the one at is doing this is bad. I've replaced three of these this weak already
Yes you should be able to jump out the t-stat and that vat should fire up. The hi limit is so that the unit does not over heat.