Watts AERCO Benchmark OMM-0136 Operation And Service Manual page 142

Benchmark Platinum-Edge [II]: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes
Combustion oscillations.
5.
Probable causes from 3 to 16 for AIRFLOW
6.
FAULT DURING IGNITION applies for this
fault.
Delayed Interlock Jumper not properly installed
1.
or missing.
DELAYED
Device proving switch hooked to interlocks is
2.
INTERLOCK
not closed.
OPEN
Direct drive signal is not present:
1.
•
Not yet installed.
•
Wrong polarity.
•
Signal defective at source.
•
Broken or loose wiring.
DIRECT DRIVE
SIGNAL FAULT
Signal is not isolated (floating).
2.
Edge Controller signal type selection switches
3.
not set for correct signal type (voltage or
current).
Worn Flame Detector.
1.
FLAME LOSS No spark from Spark Igniter.
2.
DURING IGN
Defective Ignition Transformer.
3.
OMM-0137_E • GF-211 •
12/13/2019
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Corrective Action
5. Run unit to full fire. If the unit rumbles or runs rough, perform
combustion calibration.
See CORRECTIVE ACTIONS from 3 to 12 for AIRFLOW FAULT
6.
DURING IGNITION.
Check to insure jumper is properly installed across the Delayed
1.
Interlock terminals in the I/O Box.
If there are 2 external wires on these terminals, check to see if an
2.
end switch for a proving device (such as a pump, louver, etc.) is
tied these interlocks. Ensure that the device and/or its end switch is
functional. A jumper may be temporarily installed to test the
interlock.
Check I/O Box to ensure signal is hooked up.
1.
•
Hook up if not installed.
•
If installed, check polarity.
•
Measure signal level.
•
Check wiring continuity between source and unit.
Check signal at source to ensure it is isolated.
2.
Check DIP switch on the Controller's Interface board to ensure it is
3.
set correctly for the type of signal being sent. Check control signal
type set in Advanced Setup
Configuration screen.
Remove and inspect the Flame Detector for signs of wear. Replace
1.
if necessary.
Close the internal gas valve in the unit. Install and arc a spark
2.
igniter outside the unit.
If there is no spark, check for 120VAC at the primary side to the
3.
ignition transformer during the ignition cycle.
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