Rheem IKONIC RTGH-S11i Training And Service Manual page 41

ERROR CODE DIAGNOSTICS
2.2 ERROR CODE LIST
A2## ERROR CODE WATER HEATER COMM. FAILURE INSTANCE ##
(## IS NO.02 TO NO,20)
EXPLANATION
This water heater can manifold up to 20 units. In this
case, these water heaters have to have a set instance
for each unit. To set the instance for each unit, refer to
section "1.6.4 Network instance"
If one of the water heaters in the manifold unit displays
an error code, the manager water heater displays the
"A2##" error code on the Liquid Crystal Display (LCD)
on the User Interface.
For example, if 20 water heaters are in a manifold and
the unit of instance, No.5, displays the same error
code, the manager water heater (instance No.1) dis-
plays "A205" error code.
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IKONIC Tankless Water Heater Service Manual
DIAGNOSTIC CHECK ITEMS
• Water heater error code is displayed.
CHECK METHOD
Confirm the water heater error code displayed, and
make a diagnosis corresponding to the error code.