Weil-McLain SlimFit Manual page 110

SlimFit
™
commercial condensing gas
Troubleshooting
Figure 103 Troubleshooting suggestions for SlimFit boilers
Display Condition
ILk OFF (gas Low gas pressure
Pressure Low) switch is open
ILk OFF (gas High gas pressure
Pressure high) switch is open
ILk OFF (Low Water Occurs when Low
Level) Water Cutoff Device
detects Low water
condition
ILk OFF (External Occurs when external
Limit) limit opens (ILK).
LCI OFF (Min Air Min air flow switch is
Flow Switch) opened during run
LCI OFF (Load Occurs when external
Control Input)
limit opens (LCI).
PII OFF (Pre-
Occurs when external
Ignition ILk)
limit opens (PII).
110
-
fired water boiler
(continued)
(continued)
Diagnostics
Requires manual reset of low gas
pressure switch and Sola Control
Requires manual reset of high gas
pressure switch and Sola Control
Requires manual reset of low water cutoff
and Sola control.
Requires manual reset
Automatically resets.
Automatically resets. Boiler will not enter
prepurge until LCI is closed
Requires manual reset. Ignored during
run
— Boiler Manual
Corrective actions
• Check gas supply pressure, adjust regulator to specification
• Check gas supply pressure, adjust regulator to specification
100% Lockup regulator required
• Check for low water condition in system. Repair system as
necessary refer to piping section of this manual.
• If low water condition does not exist check Low water level
Boiler Icon-Diagnostics-Digital I/O screen to view status of Low
Water Cutoff. If shown as OFF check wiring between LWCO and
Sola.
• Probe may be checked by grounding the tip of the probe to
the heat exchanger. If fault continues after reset, replace LWCO
probe
• Is there an external safety device connected? If yes, trouble
shoot the external limit to determine and correct the cause that
opened the limit. Also check for loose wiring connections.
• If no external safety devices are installed, remove the top cover
and ensure a jumper is installed between ILK terminals on
terminal block
• Check for flue pipe and intake pipe restrictions or blockage
• Check continuity of flue pressure switch, normally open switch
(no air flow)
Check minimum air flow switch relay in control tray. Terminals
4 and 5 should be normally closed, when gas valve energizes
terminals 4 and 5 should open
Check continuity of minimum air flow switch relay wiring
• Is there an external safety device connected? If yes, trouble
shoot the external limit to determine and correct the cause that
opened the limit. Also check for loose wiring connections.
• If no external safety devices are installed, remove the top cover
and ensure a jumper is installed between LCI terminals on
terminal block
• Is there an external safety device connected? If yes, trouble
shoot the external limit to determine and correct the cause that
opened the limit. Also check for loose wiring connections.
• If no external safety devices are installed, remove the top cover
and ensure a jumper is installed between PII terminals on
terminal block
Part number 550-100-116/0713