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Let's start by making sure the vent on side of unit is not blocked rt filled with snow.
Usually has a hood and located by louvered inlet
1. Give me complete model on unit
2. Tell me exactly what if anything happens on call for heat
Thanks. Now open the service panel and tell me if we have a blinking light on control board and if so pattern of blink.See below
Sorry had to reboot computer.let me get my manual opened back up.
Thanks for your patience. The 7 flash code indicates a flame rollout switch is tripped. Look just above burners for small rollout switches with 2 wires attached and small red button in between wires, Push those buttons and lets see if they will reset.
Looks like someone may have replaced with wrong switch.These should have a reset button as shown earlier.Also looks like one may already be bypassed .Picture gets a bit blurry when I enlarge so I cant really tell on it.
For a test to see if code will o awy and burners light, unplug and connect the blue wires to this switch.