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Don't know what heater you have, but here's an Atwood Hydroflame guide if you count the flashes.
NUMBER OF LED FLASHES DIAGNOSTIC INFORMATION LOCKOUT
1 Low Input voltage SOFT
2 Ignition Failure SOFT
3 Open High Limit SOFT
4 Stuck Sail Switch HARD
5 Module Fault HARD
NOTE: A SOFT lockout is a condition that is timed and will make additional
attempts to correct the problem. A HARD lockout requires reset of
the thermostat or turning the power switch off then back on
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