Watts AERCO Benchmark BMK5000 User Manual

Benchmark with Edge [I]: Operation-Maintenance Manual
SECTION 9 – TROUBLESHOOTING
OMM-0145_D • GF-218 • 11/2/2020 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 155 of 213
TABLE 9-1: Boiler Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
5. Defective IGST Board.
5. Check “Heartbeat” LED DS1 and verify it is
blinking ON & OFF every second. If not,
replace IGST Board.
PRG SWTCH
OPEN
DURING
PURGE
1. Defective Purge switch.
1. If the air-fuel valve does rotate, check Purge
switch for continuity when closing. Replace
switch if continuity does not exist.
2. No voltage present at switch.
2. Measure for 24 VAC from each side of the
switch to ground. If 24VAC is not present,
refer fault to qualified service personnel.
3. Switch wired incorrectly.
3. Check to ensure that the switch is wired
correctly (correct wire numbers on the
normally open terminals).
4. Defective Power Supply Board
or fuse.
4. Check DS1 & DS2 LEDs on Power Supply
Board. If they are not steady ON, replace
Power Supply Board.
5. Defective IGST Board.
5. Check “Heartbeat” LED DS1 and verify it is
blinking ON & OFF every second. If not,
replace IGST Board.
OUTDOOR
TEMP
SENSOR
FAULT
1. Loose or broken wiring.
1. Inspect Outdoor Temperature sensor for loose
or broken wiring.
2. Defective Sensor.
2. Check resistance of sensor to determine if it is
within specification.
3. Incorrect Sensor.
3. Ensure that the correct sensor is installed.
RECIRC
PUMP
FAILURE
1. Internal recirculation pump
failed.
1. Replace recirculation pump.
REMOTE
SETPT
SIGNAL
FAULT
1. Remote setpoint signal not
present:
• Not yet installed.
• Wrong polarity.
• Signal defective at source.
• Broken or loose wiring.
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 unit.
2. Signal is not isolated (floating) if
4 to 20 mA.
2. Check signal at source to ensure it is isolated.
3. Edge [i] Controller signal type
selection switches not set for
correct signal type (voltage or
current).
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 the Remote
Signal parameter (Advanced Setup→ Unit →
Application Configuration).
RESIDUAL
1. Defective Flame Detector.
1. Replace Flame Detector.

Watts AERCO Benchmark BMK5000 Specifications

General

Brand	Watts
Model	AERCO Benchmark BMK5000
Category	Boiler
Language	English