Watts Aerco Benchmark Series User Manual

Benchmark Platinum-Edge: Operation-Service Manual
SECTION 6 – TROUBLESHOOTING
OMM-0137_D • GF-211 • 7/16/2019 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page 142 of 146
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes Corrective Action
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 Controller.
2. Loose wiring connection to the stepper motor. 2. Inspect for loose connections between the Air/Fuel Valve motor and
the wiring harness.
3. Defective Air/Fuel Valve stepper motor. 3. Replace stepper motor.
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.
6. Air/Fuel Valve out of calibration 6. Perform the stepper motor calibration procedure (Main Menu 
Diagnostics

Subsystems

Air Fuel Valve Stepper Motor).

Watts Aerco Benchmark Series Specifications

General

Brand	Watts
Model	Aerco Benchmark Series
Category	Boiler
Language	English