Thank you for making this video. I do all my own work, with everything we have here at our house, if I can. I love videos like this. I did exactly what you said, and my heater started working. When I turned the power on, only the fan would run. I tapped on the part you mentioned and reinstalled. Heater is now working, and I'll order the replacement part. Thanks again, great job explaining it!
Thank you, DIY Dad! I have the exact same heater in a commercial greenhouse. Same error code, control board LED flashing 4 times. Heater would turn the fan on high without prompt from the thermostat but not ignite. I just replaced the control board, high limit sensor and pressure switch … but one of those pesky little roll out sensors had tripped. After checking both of them and depressing the hidden reset button (thanks for the tip!) it’s working great again and keeping the tree ferns warm.
I reset the rollout sensors and started the unit and saw the flames rolling out and the sensors tripped within a minute. I then blew out the screens at the gas jet outlets and reset the sensors again and seems to be fixed, been running for over an hour with no rollout. So thanks again for showing where the resets are on the rollout sensors.
Thanks. I have the four blinks so will check the sensors. Unfortunately it's black around the heat tubes suggests some rollout. The heater is less than a year old
Best of luck! Insulated the walls of my garage this last summer which has resulted in my heater running far less and haven’t had to touch it since that video (the original sensor lasted only about 2 months) Given how cold it has been this winter I would check your heater’s exhaust path for icing or snow buildup - either could cause some roll back.
@@philhanson7624 Honestly I don't recall - I pulled the sensor and read the part number off of it, then did a google search for that part number. I am pretty sure I got the replacement from Amazon or Supplyhouse.com
I’m not sure.. but it would stand to reason that there would be a failure limit sensor to avoid a heating element melting or damaging itself in an over-volt situation
If it’s a Mr. Heater Big Maxx 80,000 btu furnace, the manyal says: 2 flashes: System Lockout - failure to detect or sustain flame. Current signal at FLAME terminal less than 6 micro amps. If your heater is trying to ignite but won’t stay on, it’s probably a flame sensor or the control board. When my heater gave me this code I replaced the control board with a kit I got on ebay and it worked fine again even after sitting for 3 years. Hope that helps!
2 blinks usually means "System lockout, failure to detect or sustain flame". - If it doesn’t fire up at all it could still be a bad igniter or a gas flow problem. Does it do the normal prelight stuff? Should buzz and cycle a bit before ignition usually happens. If it does all that but doesn’t smell of gas at all up by the unit I’d expect a flow issue (gas off or a bad valve or regulator) if you smell gas I’d expect a bad igniter
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Thank you for making this video. I do all my own work, with everything we have here at our house, if I can. I love videos like this. I did exactly what you said, and my heater started working. When I turned the power on, only the fan would run. I tapped on the part you mentioned and reinstalled. Heater is now working, and I'll order the replacement part. Thanks again, great job explaining it!
Excellent! Thats my entire goal with the channel!
you are the man diy dad - you saved me from freezing!
Awesome! Glad it helped!
Thank you, DIY Dad! I have the exact same heater in a commercial greenhouse. Same error code, control board LED flashing 4 times. Heater would turn the fan on high without prompt from the thermostat but not ignite. I just replaced the control board, high limit sensor and pressure switch … but one of those pesky little roll out sensors had tripped. After checking both of them and depressing the hidden reset button (thanks for the tip!) it’s working great again and keeping the tree ferns warm.
Awesome! Glad I could help!
Thanks for the good advice I was able to flick the sensor like you said and the furnace kicked back on! Now I will order the new one immediately!
Awesome! Glad that worked for you!
I reset the rollout sensors and started the unit and saw the flames rolling out and the sensors tripped within a minute. I then blew out the screens at the gas jet outlets and reset the sensors again and seems to be fixed, been running for over an hour with no rollout. So thanks again for showing where the resets are on the rollout sensors.
Excellent! Glad that was helpful to you!
Thanks. I have the four blinks so will check the sensors. Unfortunately it's black around the heat tubes suggests some rollout. The heater is less than a year old
Best of luck! Insulated the walls of my garage this last summer which has resulted in my heater running far less and haven’t had to touch it since that video (the original sensor lasted only about 2 months)
Given how cold it has been this winter I would check your heater’s exhaust path for icing or snow buildup - either could cause some roll back.
Where did you purchase the sensor?
@@philhanson7624 Honestly I don't recall - I pulled the sensor and read the part number off of it, then did a google search for that part number. I am pretty sure I got the replacement from Amazon or Supplyhouse.com
Thanks, this solved my problem!
Thanks for video! I said fu@k it and installed a Reznor. No more mr. Heater for me 😊
Hah - I get it. Since swapping that sensor mine has run trouble free.. but they seem to be subject to build quality issues
Is there temperature sensors that will also fail on the electric model
I’m not sure.. but it would stand to reason that there would be a failure limit sensor to avoid a heating element melting or damaging itself in an over-volt situation
I’m getting 2 flashes for system failure. I’m not finding anything online that tells me how to fix this.
What model number of furnace?
If it’s a Mr. Heater Big Maxx 80,000 btu furnace, the manyal says:
2 flashes: System Lockout - failure to detect or sustain flame. Current signal at FLAME terminal less than 6 micro amps.
If your heater is trying to ignite but won’t stay on, it’s probably a flame sensor or the control board. When my heater gave me this code I replaced the control board with a kit I got on ebay and it worked fine again even after sitting for 3 years. Hope that helps!
What causes a 2 green light code?? Does not fire up … flashes 2 green light code… ignitiners are clean???
2 blinks usually means "System lockout, failure to detect or sustain flame". - If it doesn’t fire up at all it could still be a bad igniter or a gas flow problem.
Does it do the normal prelight stuff? Should buzz and cycle a bit before ignition usually happens. If it does all that but doesn’t smell of gas at all up by the unit I’d expect a flow issue (gas off or a bad valve or regulator) if you smell gas I’d expect a bad igniter
Omg. Get to it