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TROUBLESHOOTING ERROR MESSAGES
TROUBLESHOOTING ERROR MESSAGES
This section is provided to help diagnose and correct iCOMM™ system operational
problems. In the tables that follow the first column shows the error message as displayed on
the CM (communication module) LCD screen. The first column also includes an explanation,
a list of possible causes and applicable service notes. The second column contains a list of
diagnostic procedures to correct common causes for the error message displayed.
NO UNITS FOUND
DISPLAYED MESSAGE
CONDITION/INDICATES
CHECK/REPAIR
“No Units Found”
The CM (communication module) is unable to
establish a connection to any water heating
appliances (Units) on the network.
Possible Causes:
• Network cable(s) improperly connected
• Defective network cable(s)
• Defective Splitter - T Adapter(s)
• Defective MDA(s)
Service Notes:
Press the Display Button on the CM several times to
silence the alarm if it is sounding - see Figure 2 on
page 6 and Display Button Operation on page 30.
If one or more appliances on a Multiple Appliance
Network are not listed on the CM’s
“Units @
Addresses”
screen but at least one appliance is;
the error message above would not be displayed.
Follow the steps listed here to correct this problem.
Ensure there are not more than 7 tank type water
heaters (maximum allowed) on a Multiple Appliance
Network (see page 20).
• Reboot the CM. Disconnect the round “5 VDC”
power plug to the CM for 10 seconds. Reconnect
the round “5 VDC” power plug to the CM and wait
5 minutes to establish all connections.
• Cycle power off and on again to all connected
appliances. Wait 5 minutes to establish all con-
nections.
• Ensure the correct CM network port “SINGLE” or
“MULTI” is being used for the type of network con-
figuration present - see pages 11 - 20.
• Ensure the network cables, Splitter - T Adapters
and MDAs are properly connected at all the appli-
ances on the network - see pages 11 - 20.
• Ensure each connected appliance has a unique
network address between 1 and 31 - see pages
25 - 28.
• Check all network cables between appliances and
the CM with an network cable tester - see Tool
Requirements on page 4. Repair/replace any
defective cables.
• Check all Splitter - T Adapters (see Figure 7 on
page 13 and page 19) in use with a network cable
tester - see Tool Requirements on page 4. Repair/
replace any defective T Adapters.
• Ensure the green power lights on MDAs in use
are illuminated - page 16. If all the procedures
described above and in the Service Notes in the
first column of this table have been performed first
- replace any MDAs that do not have their green
power LED illuminated.
• If all the above steps have been performed and
the problem has not been corrected - call 888
928-3702 for further technical assistance.
CM LCD Error Message
