AERCO BMK 1.5 LN Dual Fuel Jan 2009 - Manual (Page 60)

TROUBLESHOOTING
TABLE 8-1. BOILER TROUBLESHOOTING – Continued
FAULT INDICATION PROBABLE CAUSES CORRECTIVE ACTION
(continued) 6. PROBABLE CAUSES from 3 to 16 for
AIRFLOW FAULT DURING IGNITION
apply for this fault
7. Unit set for propane operation, but Max
Fire Rate was not changed to 70%.
6. PROBABLE CAUSES from 3 to 16 for AIRFLOW FAULT
DURING IGNITION apply for this fault.
7. Check Max Fire Rate setting in Configuration Menu.
DELAYED
INTERLOCK OPEN
1. Delayed Interlock Jumper not installed
or removed.
2. Device proving switch hooked to
interlocks is not closed
1. Check for a jumper properly installed across the delayed
interlock terminals in the I/O box.
2. If there are 2 external wires on these terminals, check to see if
an end switch for a device such as a pump, louver, etc. is tied
these interlocks. Ensure that the device and or its end switch are
functional. (jumper may be temporarily installed to test interlock)
DIRECT DRIVE
SIGNAL FAULT
1. Direct drive signal is not present:
Not yet installed.
Wrong polarity.
Signal defective at source.
Broken or loose wiring.
2. Signal is not isolated (floating).
3. Control Box signal type selection
switches not set for correct signal type
(voltage or current).
1. Check I/O Box to ensure signal is hooked up.
Hook up if not installed.
If installed, check polarity.
Measure signal level.
Check continuity of wiring between source and boiler.
2. Check signal at source to ensure it is isolated.
3. Check DIP switch on PMC board to ensure it is set correctly for
the type of signal being sent. Check control signal type set in
Configuration Menu.
FLAME LOSS
DURING IGN
1. Burner Ground Screw not installed or
loose.
2. Worn flame detector
3. No spark from Spark Plug
4. Defective Ignition Transformer
5. Defective Ignition/Stepper (IGST)
Board
6. Staged Ignition ball valve is closed.
1. Inspect and install/retighten Burner Ground Screw.
2. Remove and inspect the flame detector for signs of wear.
Replace if necessary.
3. Close the internal gas valve in the boiler. Install and arc a spark
ignitor outside the unit.
4. If there is no spark, check for 120VAC at the primary side to the
ignition transformer during the ignition cycle.
5. If 120VAC is not present, the IGST Board in the Control Box may
be defective. Refer fault to qualified service personnel.
6. Check position of Staged ignition ball valve on gas train. See
Figure 8-1 at end of this Chapter.
8 -4