Boiler Control Instruction & Operation Manual
Page 5
4
of
68
Trouble- Shooting
Soft Lockouts (Holds) Continued
Lockout
Number
Condition
Possible Cause
13
Flame rod
shorted to
ground
Flame rod shorted to ground
-
Shorted or miswired flame rod wiring.
-
Defective flame rod.
14
Delta T
inlet/outlet high
Temperature rise between supply
and return is too high.
-
Inadequate boiler water flow. Verify that circulator is
operating and that circulator and piping are sized per
Installation Instructions Manual, Water Piping and Trim
Section.
15
Return
temp
higher than
supply
The Control is reading a return
sensor temperature higher than
the supply sensor temperature.
Condition must be present for at
least 75 seconds for this error
code to appear.
-
Flow through boiler reversed. Verify correct piping and
circulator orientation.
-
No boiler water flow. Verify that system is purged of air
and that appropriate valves are open.
-
Sensor wiring reversed.
-
Supply or return sensor defective.
16
Supply temp
has risen too
quickly
Supply water temperature has
risen too quickly.
-
See possible causes for
“Hard Lockout 4”.
-
Inadequate boiler water flow.
-
Verify that circulator is operating and that circulator and
piping are sized per Installation Instructions Manual,
Water Piping and Trim Section.
17
Blower
speed not
proved
Normal waiting for blower speed
to match purge and light-off
setpoint.
-
27
Interrupted
Airflow
Switch On
Interrupted Airflow Switch Failed in
closed position
-
The air proving switch has failed on, check switch is
operating properly
27 or
28
Interrupted
Airflow
Switch Off
Interrupted Airflow Switch Failed to
Close
-
The air proving switch has failed to close;
-
Check switch, check switch connection and wiring.
-
Blocked vent, blocked inlet, blocked or disconnected inlet
air switch tube, blocked heat exchanger or burner.
-
Something is blocking air/flue gas flow through boiler
