Pool and Spa
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What LED's are lit on the panel when/after it shuts down?
This is usually a problem with the high limit sensors. There are 3 LED's on the back of the board. Which ones are lit will shed more light on this.
Ok, you need to check for 24 VAC at the Fenwall ignition control (top of the control > 24 VAC & IND terminals). If you have no voltage there then you have to trace the leads back to the transformer and check for bad connections and voltage across each side of every device in that circuit. Or you can power it down and check continuity across each device.
Those indicator lights could indicate a hi limit fault. You need a meter to check. The other option since you don't have one is to jump out (one at a time) every device in the circuit between the transformer and the Fenwall
You set the meter on an AC voltage scale above 24 vollts (200 is common) then probe (1 probe on each terminal)the Fenwall terminals mentioned above. Also you don't need a meter to jump out the device between the Fenwall and the transformer. You just connect the 2 leads together.