SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 7
– TROUBLESHOOTING
OMM-0069_0H
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TROUBLESHOOTING
7.1 INTRODUCTION
The troubleshooting procedures provided in this chapter are intended to aid service and
maintenance personnel in isolating the most probable cause of a fault in a packaged SmartPlate
Water Heater. Prior to performing the troubleshooting steps and procedures in this chapter,
perform the following preliminary checks:
TROUBLESHOOTING Instructions
1. Ensure that external AC power at 120 VAC or 220 VAC is being supplied to the SmartPlate
ECS/SP Control Box.
2. Check to ensure that all Electronic Control System (ECS/SP) electrical cable connections
are secure.
3. Ensure that the Electronic Control Valve (MXG-461) is securely connected to the cable
plug from the ECS/SP Control Box.
4. Check the fuse in the ECS/SP Control Box that supplies power the Recirculation Pump an
Electronic Control Valve.
5. Ensure that both the upstream and downstream shut-off valves are fully open.
6. Check the circuit breaker on the 24 VAC Transformer inside the ECS/SP Control Box.
NOTE:
In addition to the procedures contained in this chapter, also check the troubleshooting
sections of the Boiler Operation and Maintenance Manual being used with the Water Heater
and any other ancillary equipment manuals associated with the installation.
7.2 TROUBLESHOOTING PROCEDURES
Troubleshooting procedures for SmartPlate Water Heaters are provided in Tables 7-1, 7-2 and
7-3. Table 7-1 provides troubleshooting procedures for the MXG-461 Control Valve and Piping
Assembly components. Table 7-2 provides troubleshooting procedures for the ECS/SP
Electronic Control System. Table 7-3 provides a troubleshooting guide to aid in resolving
temperature control issues which may be encountered during Water Heater operation. Also,
when troubleshooting ECS/SP faults related to the Temperature Controller (Eurotherm, model
2408), refer to Appendix A for additional information concerning process fault and diagnostic
alarms.
When a fault occurs in a SmartPlate Water Heater, proceed as follows to isolate and correct the
fault:
TROUBLESHOOTING PROCEDURES Instructions
1. Refer to the FAULT INDICATION column in the following tables and locate the fault that
best describes the existing conditions.
2. Proceed to the PROBABLE CAUSE column and, if more than one item is listed, start with
the first item shown for the fault condition.
