Rheem SVC 810, Troubleshooting Manual

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SVC 810 Tankless Troubleshooting Manual
37
Error Code 03 (MIC-180 & EZLink Only)
Explanation: Manifold Control Failure. The unit has lost the communications link between itself
and the MIC-180; or between the two units with EZLink.
At a minimum check the following:
1. Verify the communications cable is plugged into
the printed circuit boards on the water heaters and
the MIC-180.
2. Verify #4 Dip Switch is in the ON position for
each water heater in the manifold.
Test Run Mode
1.
Remove the front cover of the manifold controller.
2. Change the DIP switch #1 setting on the main
communication PCB to “ON” position (UP). DO NOT
alter any other DIP switch.
3. By pressing the SW2 button located below the LED display on the main communication
PCB, the number of the water heater to be tested can be selected. The left two digits flashing
on the LED display of the main communication PCB indicates the number of the water that
has been selected.
Conduct continuity check of the communications cable.
Did the unit go
to main burner?
Yes
No
Replace the Printed Circuit Board
Replace communications cable
Turn power off. Unplug the communications cable from all units. Turn each unit ON (one at a
time) and make an attempt for main burner. We are trying to see if each unit works without the
communications cable links. If a unit does not go to main burner, then troubleshoot that unit.
Then, one at a time, reconnect the communications cable and go main burner.
Everything appears to be normal.