1. you don't declare the specific product you have, Boyer
is a company brand. ( not that is matter that much...)
2. with most solid state ignition devices you have 3 failure modes, in additions there are various wiring malfunctions as Greg has pointed out.
3 the intenal trigger circuit can fail or go intermittant (rare)
4..WithIn the modules, the output transistor can fail in 3 fashions . Much more common.
A.In all cases it is basically heat related which manifest in mostly one of 3 ways.
B.The output transistor goes permanent short. Touching the leads makes a manual
C The output transistor is highly degraded and response becomes erratic as the box heats up, eventually goes into total short B
A variety of wiring connecting and trigger resetting does not yield reliable results
D Very rare is the transistor burns open and is totally non responsive and infinite resistance is open, no manual
spark is possible.