Burnham ES2 - Manual (Page 19)

1
If "Err" IS displayed on the IQ Boiler Control: "Err" flashes on the IQ Boiler control display followed
by a number. Use the following table along with this error number to determine the problem and possible
causes:
IQ Boiler Control Error Codes (when "Err" is flashing)
Display Status Boiler / Control Action(s)
Blank Boiler and Circulator off No 120 Vac power at boiler, check breaker and wiring between breaker panel and boiler.
Err 4
Flame Current Lower
than Threshold
Check pilot assembly.
Err 6
Flame Sensed Out of
Normal Sequence
Flame sensed out of normal sequence (before opening gas valve or after closing gas
valve).
Err 18 Electronics Failure Replace Control .
Err 24
Flame Sensed During
Post-Purge
Flame sensed during post-purge (after gas valve signaled closed).
Err 32
Temperature Sensor
Failure
Temperature sensor or interface failure (open or short connection, increased connection
resistance, dual sensor mismatch) or control hardware failure.
Err 55
Damper Failed
to Open
Atmospheric Damper End Switch failed to close (end switch contacts stuck open).
Err 56 Damper Failed to Close Atmospheric Damper End Switch failed to open (end switch contacts stuck closed).
Err 57
Flame Rod Shorted to
Burner Ground
Flame Rod shorted to burner ground, this can result from excessive flue gas
condensation.
Err 58 AC Line Frequency Error AC Signal is too noisy or frequency is incorrect.
Err 59 Line Voltage Error AC voltage out of specification high or low.
Err 60
Thermostat Input Higher
than Threshold
Check thermostat wiring.
Err 61 Line Voltage Unstable Possibly too many heavy loads switching on and off cause erratic supply voltage.
Err 63
Soft Lockout - Maximum
Recycles Exceeded
Maximum number of recycles exceeded.
Err 64
Soft Lockout - Internal
Failure
Caused by general electronics failure such as relay open or shorted contacts, flame
sensing circuit error, or A to D error.
tRoUBLeShootING (continued)
IQ Boiler Control Status Codes (when "Err" is not displayed) - continued
Display Status Boiler / Control Action(s)
20
Damper Failed
Open
The damper end switch has not closed (damper end switch is open) at the beginning of
the heat cycle. An alarm message is sent but the control is not in lockout.
21
Damper Failed
Closed
The damper end switch has not opened (damper end switch is closed) at the
beginning of the heat cycle. An alarm message is sent but the control is not in lockout.