Boiler Control Instruction & Operation Manual
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Trouble- Shooting
Soft Lockouts (Holds)
Display Faults
When a soft lockout occurs, the boiler will shut down and the
“Help” button will “blink”. Select the “blinking”
“Help” button to determine the cause of the soft lockout. The boiler will automatically restart once the condition
that caused the lockout is corrected.
Figure 24
: Soft Lockout Example
The Soft Lockout screen will display the Hold number, name of the Hold, the condition that caused the Hold,
possible causes, and a basic description of corrective actions that may be taken to fix the problem.
Below is an in-depth guide to all possible lockouts.
Lockout
Number
Condition
Possible Cause
1
Anti-Short Cycle
Minimum time between starts has
not been reached. Normal delay
used to avoid excessive cycles.
-
Faulty contact provided by the EMS system.
2
Boiler Recycling
Limits Open
(LCI OFF)
The LCI input is not energized.
-
Limit Control Input (LCI) is not
‘ON’. Refer to limit string
screen for list of limits.
-
A wire is loose.
3
Boiler Safety
Limit Open
Boiler Safety Limit Interlock (ILK)
is OFF.
-
Lockout input (ILK) is not
‘ON’. Refer to limit string screen
for list of limits.
-
Loose wiring to limit device.
-
Jumper not installed.
7
Return sensor
fault
Shorted or open return temperature
sensor.
-
Shorted or miswired return sensor wiring.
-
Defective return sensor.
8
Supply sensor
fault
Shorted or open supply
temperature sensor.
-
Shorted or miswired supply sensor wiring.
-
Defective supply sensor.
9
DHW sensor
fault
Shorted or open Domestic Hot
Water (DHW) temperature sensor.
-
Shorted or miswired DHW sensor wiring.
-
Defective DHW sensor.
10
Stack sensor
fault
Shorted or open flue gas (stack)
temperature sensor.
-
Shorted or miswired flue temperature sensor wiring.
-
Defective flue temperature sensor.
