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 137 of 146
TABLE 10-1: Boiler Troubleshooting Procedures
Fault Probable Causes Corrective Action
2. Defective SSOV Actuator.
2. If gas supply pressure downstream of SSOV Actuator cannot be
lowered to the range specified in Table 4-1 (Natural Gas) or Table 4-
4 (Propane) in Section 4.4: Combustion Calibration of this guide; the
SSOV Actuator may be defective.
3. Defective
High Gas Pressure
switch.
3. Remove the leads from the High Gas Pressure switch. Measure
continuity across the common (C) and normally closed (NC)
terminals with the unit not firing. Replace the switch if continuity
does not exist.
HIGH WATER
TEMP SWITCH
OPEN
1. Faulty Water temperature switch.
1. Test the temperature switch to insure it trips at its actual water
temperature setting.
2. Incorrect PID settings. 2. Check PID settings (Advanced Setup  Performance 
Temperature Control, first 3 items). If the settings have been
changed, record the current readings then reset to default values.
3. Faulty shell temperature sensor.
3. Using the resistance charts in Section 2 of the Benchmark Platinum-
Edge: REFERENCE Manual (GF-212) measure the resistance of
Shell sensor and BTU sensor at a known water temperature.
4. Unit in Manual mode.
4. If unit is in Manual mode, switch to Auto mode (Diagnostic 
Manual Run, set Manual Mode = Enabled).
5. Unit setpoint is greater than Over Temperature
switch setpoint.
5. Check setpoint of unit and setpoint of Temperature switch; Ensure
that the temperature switch is set higher than the unit’s setpoint.
6. System flow rate changes are occurring faster
than units can respond.
6. If the system is a variable flow system, monitor system flow changes
to ensure that the rate of flow change is not faster than what the
units can respond to.
HIGH WATER
TEMPERATURE
1. See HIGH WATER TEMPERATURE SWITCH
OPEN.
1. See HIGH WATER TEMPERATURE SWITCH OPEN.
2. Temp HI Limit setting is too low. 2. Check Temp HI Limit setting.
IGN BOARD
COMM FAULT
1. Communication fault has occurred between the
PMC board and Ignition/Stepper (IGST) board.
1. Press CLEAR button and restart unit. If fault persists, contact
qualified Service Personnel.
2. 32 Pin Ribbon cable defective.
2. Replace 32 Pin Ribbon cable.

Watts Aerco Benchmark Series Specifications

General

Brand	Watts
Model	Aerco Benchmark Series
Category	Boiler
Language	English