Has Your Outdoor Boiler Overheated?
How To Avoid Permanent Damage
If your outdoor boiler has overheated, you may have a problem that will permanently damage your boiler. This must be addressed immediately!
We recommend that you evaluate the possible causes (listed below) and the corresponding solutions (also listed below) so that you can take the necessary steps to PROTECT your outdoor boiler from permanent damage.
|Door left open||An unlimited supply of air to the firebox is bad - it will lead to uncontrolled burning of wood fuel in the firebox that will damage the firebox steel. Please never leave the furnace firebox door open for extended periods of time. The door should only be open for brief moments to add wood fuel to the firebox and remove ash.
|Pump failure||Remove silver button on face of pump while pump is in operation to verify impeller shaft is spinning. If not, replace pump. See article on how to diagnose pump failure by clicking on this link HERE. For replacement pump special, call (231) 221-0104.
|High limit switch cannot be reset||Must wait until water temp drops below approx. 150 degrees to reset. Also, High Limit Switches have only a limited number of trips in their lifespan. This depends upon how hot and how many times the furnace high temps. A very high temp situation may kill the switch in one trip. Or it may last 12+ trips. Always have a spare on hand. Click HERE for more info on High Limit Switches.
|Power outage/poor quality power||Can cause pump to stop running. If this happens while fire is burning hot, then without the pump circulating water, the water temp in the boiler will rise and likely trip the high limit switch. Turn off breaker for 3 min, turn back on. Reset the high limit switch by pressing the red button until it clicks and fan and light have power.
|Poor door seal / Fan Seal||
Again, an unlimited supply of air to the firebox is bad - it will lead to uncontrolled burning of wood fuel in the firebox that will damage the firebox steel. If the door seal is more than 2-3 years old, replace door seal gasket. Click HERE for more info.
Also, if you installed a new fan, the seal around the two fan openings (inlet and outflow) must be tight. New furnaces are shipped with a gasket, replacement fans must have our High Temp Silicon Caulk applied to this seal to prevent air leaks.
|Wood load too close to front door.||Wood, ash and hot coals must not be located within 6-8 inches from the inside of the front door frame (inside wall of firebox)
|Damper not closing properly||Take off the fan cover box on front firebox door (for GX Series boilers, locate the fan in rear of boiler). Actuate the fan switch a few times to watch the solenoid opening and closing the damper to verify proper operation. If not closing properly, adjust as needed.|
For more information, click HERE to read our newsletter on this topic.