Boiler Status and Soft Lockout Codes
See manual 240006104 for complete details on Boiler Status Codes and Soft Lockouts.
STANDBY MODE - BOILER SEQUENCE DISPLAY
After display shows Stby for a brief period, the first character shows boiler status, followed by boiler outlet water temp. If the burner is being held off
due to a soft lockout, the display alternates between showing "9" followed by boiler outlet water temp. and "b" followed by the two-digit codes below.
Soft lockout means the boiler will start again automatically if the condition is corrected or timed out
Press [RESET] button to restart boiler without waiting for timeouts below.
First Other Boiler Status First Code Boiler is in soft lockout when "9" or "b" shown.
Digit Digits Digit # Reason for boiler soft lockout is:
"9" alternating with "b"
Actual (measured) outlet water temperature
0Standby - no call for heat _18 Outlet temp. too high (over 203°F). Burner off until
outlet water temp. drops 9°F below target temp.
1Pre-purge (10 seconds) or
Return temp. too high (over 203°F). Burner off until both outlet
Post-purge (15 seconds) _19 and return water temp. drops 9°F below target temp.
2Ignition
3Burner on for CH heating _24 Return temp. higher than supply temp.
Burner off waiting for correction.
4Burner on for DHW heating _25 Outlet water temp. rose too quickly. Burner off 10 min. (burner
recycles, increasing wait 1 min. each attempt to max. 15 min.)
5Checking airflow before prepurge _26 Aquastat contacts open or LWCO contacts open.
Burner off because temperature setting _29 Blower signal not 0 when it should be.
6has been reached Burner off until signal condition terminates.
Temp. rise across boiler more than 58°F. Burner off
7Pump on after CH heating cycle _30 for 2_ minute wait (plus 1 minute for each failed attempt,
for run-on of 10 seconds up to max. of 22 minutes each time).
8Pump on after DHW heating cycle _61 Air pressure switch does not open.
for run-on of 30 seconds
HBurner on, running in high fire mode _65 Waiting for blower to start.
(manually set for test)
LBurner on, running in low fire mode
(manually set for test)
