U.S. Boiler Company SERIES 3, Installation, Operating And Service Instructions

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20
TROUBLEShOOTING (continued)
Use Control Display
ERR
(error) Number To Direct Troubleshooting Efforts
If the control detects an error it will flash “
Err
” (error) followed by a number. Use this number to identify
the boiler problem and corrective action in the table below. If there is no Err display proceed to next
Section
:
Display Status Recommended Corrective Action
Blank Boiler or Control is not powered
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. Refer to Troubleshooting Section, 6.
Err 6
Flame Sensed Out of Normal Sequence
Flame sensed out of normal sequence (before opening gas valve or after
closing gas valve). Check gas valve for proper operation.
Err 18
Electronics Failure Cycle power to control. Replace control if problem persists.
Err 23
Flame Sensed During Pre-purge
Flame sensed during post-purge (before gas valve signaled open). Check
the gas valve for proper operation. Replace gas valve if problem persists.
Err 32
Temperature Sensor Failure
Temperature sensor or interface failure (open or short connection, increased
connection resistance, dual sensor mismatch) or control hardware failure.
- Check sensor is securely attached to control P7 connector.
- If secure, replace sensor.
- If problem persists, replace control.
eRR 35
Duplicate Zone Alarm Refer to IQ Zone Panel Instructions.
Err 55
Damper Failed to Open
Atmospheric Damper End Switch failed to close (end switch contacts stuck
open). Refer to Troubleshooting Section, 5.
Err 57
Flame Rod Shorted to Burner Ground
Flame Rod shorted to burner ground, this can result from excessive flue gas
condensation.
- Check for excessive condensate. Dry pilot. Adjust setpoint higher.
- Check for loose or damaged ignition wire.
Err 58
AC Line Frequency Error AC Signal is too noisy or frequency is incorrect. Check supply voltage.
Err 59
Line Voltage Error
AC voltage out of specification high or low. Check supply voltage.
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. Check supply voltage.
Err 63
Soft Lockout – Maximum Recycles
Exceeded
Maximum number of recycles exceeded. Refer to Troubleshooting Section, 6.
Err 64
Soft Lockout – Internal Failure
The electronics has detected an error. This can be caused by an actual
controller internal fault or wiring fault:
- Check vent damper, cycle power with vent damper disconnected. If error
is cleared, reconnect the vent damper and refer to Recommended
Corrective Action listed under
stA 20
, damper failed to open.
- Check pilot assembly,
- If problem persists, replace the control.
Err 89
Communication Lost Check wiring between control and IQ Zone Panel or IQ Reset Card.