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If "Err" IS displayed on the IQ Boiler Control: "Err" ashes 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 ashing)
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 ue 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 specication 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, ame
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.