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 154 of 213
TABLE 9-1: Boiler Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
OUT OF
PHASE
2. Incorrect power supply
transformer wiring.
2. Check transformer wiring, in AC Power Box,
against the power box transformer wiring
diagram to ensure it is wired correctly.
LOW GAS
PRESSURE
1. Incorrect supply gas pressure.
1. Measure gas pressure upstream of the SSOV
Actuator(s) with the unit firing. Ensure it is
above the value in Table 4-2 (Natural Gas) or
Table 4-5 (Propane).
2. Defective Low Gas Pressure
switch.
2. Measure gas pressure at the Low Gas
Pressure switch. If it is greater than 1 inch
above the Low Gas Pressure switch setting
in Table 4-2 (Natural Gas) or Table 4-5
(Propane), measure continuity across the
switch and replace if necessary.
LOW WATER
LEVEL
1. Insufficient water level in
system.
1. Check system for sufficient water level.
2. Defective water level circuitry.
2. Test water level circuitry using the Low Water
TEST and RESET buttons on the Controller’s
front panel. Replace water level circuitry if it
does not respond.
3. Defective water level probe.
3. Check continuity of probe end to the shell,
change probe if there is no continuity.
MODBUS
COMMFAULT
Unit not seeing information from
Modbus network.
Check network connections. If fault persists,
contact qualified Service Personnel.
PRG SWTCH
CLOSED
DURING
IGNITION
1. A/F Valve rotated open to
purge and did not rotate to
ignition position.
1. Start the unit. The Air/Fuel Valve should rotate
to the purge (open) position, then back to
ignition position (towards closed) during the
ignition cycle. If the valve does not rotate back
to the ignition position, check the Air/Fuel
Valve calibration. If calibration is okay, the
problem may be in the Air/Fuel Valve or the
Edge [i] Controller. Refer fault to qualified
service personnel.
2. Defective or shorted switch.
2. If the Air/Fuel Valve does rotate to the ignition
position, check the purge switch for continuity
between the N.O. and COM terminals. If the
switch shows continuity when not in contact
with the cam, check to ensure that the switch
is wired correctly (correct wire numbers on the
normally open terminals).
3. Switch wired incorrectly.
3. If the switch is wired correctly, replace the
switch.
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.

Watts AERCO Benchmark BMK5000 Specifications

General

Brand	Watts
Model	AERCO Benchmark BMK5000
Category	Boiler
Language	English