Install Instructions
19
TROUBLESHOOTING
IQ Boiler Control Status Codes (when "Err" is not displayed)
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.
1
Boiler not
responding to
Heat Request
Boiler is not seeing Heat Request. Check thermostat or zone wiring for loose connection,
miswiring, or defective thermostat or zone control.
2
Waiting for
Pressure Switch
to Open
The blower is “off” and the control waits for the pressure switch to open. This state checks if the
pressure switch has failed closed. This is checked at the beginning of a heat cycle before turning
on the blower. If the pressure switch doesn't open in 60 seconds, the control goes to
12.
3
Waiting for
Pressure Switch
to Close
The blower is turned “on”. The control is waiting for the pressure switch to close at the beginning
of a cycle. If the pressure switch doesn't close within 60 seconds, the control goes to
11.
8
Boiler Running
but Circulator
is not Running
Check wiring for loose connection, miswiring. When there is a Domestic Hot Water Heat Request
wired to the Outdoor Air Reset card the Circulator will be off for the duration of the priority time.
This to allow all of the boiler output to be provided for fast Indirect Water Heater recovery. Check
Priority Time (pt_) function using Outdoor Air Reset IQ Option Card Adjustment Mode (see Reset
Card Adjustment Mode instructions).
10
Retry Delay
The burner failed to light (no flame signal).
After a 5 minute delay, IQ Control will attempt to light the burner again.
There is no limit to the number of retries.
10
Recycle Delay
The burner loses flame during running mode (
code "8").
After a 10 second delay, IQ Control will attempt to light the burner again.
If the burner loses flame during running mode (
code "8") during the next six recycles, IQ
Control will progress to a soft lockout.
11
Pressure Switch
Failed to Open
The blower is still “off”, and the pressure switch has not opened at the beginning of the heat cycle.
An alarm message is sent but the control is not in lockout.
12
Pressure Switch
Failed to Close
The blower is still “on”, and the pressure switch has not closed at the beginning of the heat cycle.
An alarm message is sent but the control is not in lockout.
13
Soft Lockout
When a soft lockout occurs, boiler will shut down.
Boiler automatically restarts once condition that caused the lockout is corrected and the one-hour
time delay is completed.
Boiler can be restarted sooner than the time delay by using Adjustment Mode function and
manually resetting boiler (see Adjustment Mode instructions).
14
Hard Lockout
When a hard lockout occurs boiler shuts down.
Boiler will NOT automatically restart once the condition that caused the lockout is corrected.
It will be necessary to go to Adjustment Mode function to manually reset the boiler (see
Adjustment Mode instructions).
15
Wait for Limit
to Close
Heat Request occurs and start of operating sequence is halted due to an open limit.
Open limits may include Flame Roll Out Switch or Auxiliary.
Limit or Low Water Cutoff IQ Option Cards (when installed), refer to IQ Option Panel display for
additional information.
16
Flame Out of
Sequence
Flame Signal is still present when expected to be 0 (no flame).
When a problem occurs with the boiler operation, the IQ Control System easily provides specic, valuable
information to help resolve the issue quickly. The display on the IQ Boiler control should be the rst place
to check.
If "Err" IS N
OT displayed on the IQ Boiler Control: Use the following table to determine the problem
and possible causes.