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 156 of 213
TABLE 9-1: Boiler Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
FLAME
2. SSOV not fully closed.
3. Wire strand from burner head in
contact with Flame Detector
2. Check open/close indicator window of Safety
Shut-Off Valve (SSOV) and ensure that the
SSOV is fully closed. If not fully closed, replace
the valve and or actuator.
Close the Gas Shut-Off Valve downstream of
SSOV. Install a manometer or gauge at the leak
detection port between the SSOV and Gas Shut
Off Valve. If a gas pressure reading is observed
replace the SSOV Valve and/or Actuator.
3. Ensure Flame Detector is in good condition and
is not tilted inward toward burner head.
SSOV FAULT
DURING
PURGE
See SSOV SWITCH OPEN
SSOV FAULT
DURING
RUN
SSOV switch closed for 15
seconds during run.
1. Replace actuator.
SSOV RELAY
FAILURE
1. SSOV relay failed on IGST
board.
1. Press CLEAR button and restart unit. If fault
persists, replace Ignition/Stepper (IGST) Board.
2. Floating Neutral.
2. The Neutral and Earth Ground are not
connected at the source and therefore there is a
voltage measured between the two. Normally
this measurement should be near zero or no
more than a few millivolts.
3. Hot and Neutral reversed at
SSOV.
3. Check SSOV power wiring.
SSOV
SWITCH
OPEN
1. Actuator not allowing for full
closure of gas valve.
1. Observe operation of the Safety Shut-Off
Valve (SSOV) through indicator on the Valve
actuator and ensure that the valve is fully and
not partially closing.
2. SSOV powered when it should
not be
2. If the SSOV never closes, it may be powered
continuously. Close the gas supply and
remove power from the unit. Refer fault to
qualified service personnel.
3. Defective switch or Actuator.
3. Remove the electrical cover from the SSOV
and check switch continuity. If the switch does
not show continuity with the gas valve closed,
either adjust or replace the switch or actuator.
4. Incorrectly wired switch.
4. Ensure that the SSOV Proof of Closure switch
is correctly wired.
STEPPER
MOTOR
FAILURE
1. Air/Fuel Valve unplugged.
1. Check that the Air/Fuel Valve is connected to
the Edge [i] Controller.
2. Loose wiring connection to the
stepper motor.
2. Inspect for loose connections between the
Air/Fuel Valve motor and the wiring harness.

Watts AERCO Benchmark BMK5000 Specifications

General

Brand	Watts
Model	AERCO Benchmark BMK5000
Category	Boiler
Language	English