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SYMPTOM
AIRFLOW ERROR
Touch Screen Message:
Error – Low Air Flow
Low combustion airflow; soft
error; will retry in 5 minutes
WARNING
Never attempt to repair
the control module (circuit
board). If the control module
is defective, replace it
immediately.
TROUBLESHOOTING
SL 28-160 MODULATING GAS BOILER
5.3 TROUBLESHOOTING GUIDE
5.3.1 Using Control Module Errors Displayed
The bottom line of the Touch Screen is reserved for displaying the boilers error
status. The boiler status bar will normally be Green but can change colour to
Yellow or Red. The colours represent the following boiler operating status. The
text inside the bar will indicate the specific warning or alarm. If there is more than
one alarm present the text will scroll slowly through all current alarm conditions.
•
Green – Normal
•
Yellow – Warning
•
Red – Alarm
DIAGNOSIS
Check fan operation
Check/Clean
condensate trap
Check for fouled
reference lines and air
sensor
Check achieved fan
power
Water noise in vent.
Excess condensate in
venting.
REMEDY
•
Check lead is attached at fan.
•
Cycle power off/on; listen for fan initialization.
If no action, focus your attention on the fan
itself.
•
Ensure condensate trap is not blocked.
•
Check clear vinyl air pressure line for
presence of water. After disconnecting from
black air pressure sensor, blow clear (do not
blow into sensor). Check for exhaust re-
ingestion, or repeated power interruptions .
•
Go to Advanced Diagnostics and check
differential air pressure sensor (at rest and
with fan on). See Section 5.2.3.
In Advanced Diagnostics, during Pre-purge, Fan
Pressure (FP) should move close to Required
Pressure (RP); if FP is not within 30% of RP
and getting closer, then check for actual vent
system blockage: (a) disconnect intake within
boiler case; (b) open burner then fan/gas valve
looking for debris. See Section 4 – Warnings
and Cautions.
•
Check condensate trap for obstructions.
Remove obstructions and refill condensate
trap with water.
• Check vent length, size and configuration.
5-5
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Troubleshooting
