Armstrong
FAILURE CODES
LED Status Fault Description
Off
No Power to the System Control
Steady Flash (11 or more flashes with no pause)
Normal Operation (Standby or call for heat)
2 Flashes
Pressure Switch Closed When It Should Be Open
3 Flashes
Pressure Switch Stuck Open 30 Seconds or Longer After Call for Heat (System in 5-minute delay mode before next call for heat). On/off switch in "off" position during a call for heat will generate this code.
4 Flashes
Open Limit Switch or Limit Switch Circuit
5 Flashes
Flame Sense Signal Sensed Out of Proper Sequence
6 Flashes - pause - 1 Flash (see Note 1)*
Soft Lockout Type 1 (Failure to light within 4 trials for ignition)
6 Flashes - pause - 2 Flashes (see Notes 1 & 2)*
Soft Lockout Type 2 (Flame sense lost during run)
6 Flashes - pause - 3 Flashes (see Notes 1 & 2)*
Soft Lockout Type 3 (Pressure switch opened during run)
6 Flashes - pause - 4 Flashes (see Notes 1 & 2)*
Soft Lockout Type 4 (Limit or limit circuit opened during run)
6 Flashes - pause - 5 Flashes (see Note 1)*
Soft Lockout Type 5 (Flame has gone away after
Error Code 5)
6 Flashes - pause - 7 Flashes (see Note 1)*
Soft Lockout Type 7 (Self-check failure)
10 Flashes* - SV9520H8034 only
Line Input Voltage Polarity Reversed
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