Benchmark Platinum-Edge [ii]: Operation-Service Manual
SECTION 6
– TROUBLESHOOTING
OMM-0137_J
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TABLE 10-1: Boiler Troubleshooting Procedures
Fault
Probable Causes
Corrective Action
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.
IGN SWITCH
CLOSED
DURING
PURGE
1.
Air/Fuel Valve not rotating.
1.
Start the unit. The Air/Fuel Valve should rotate to the purge (open)
position. If the valve does not rotate at all or does not rotate fully
open, check the Air/Fuel Valve calibration. If calibration is okay,
the problem may be in the Air-Fuel Valve or the Edge Controller.
Refer to qualified service personnel.