Rinnai CNTRLDRCINW Operation And Installation Manual page 10

Reattach backing plate of the wired controller
To reconnect the fascia to the back plate, anchor the top lugs first as
shown below then swing the fascia down and press lightly to engage
the bottom tabs. Be careful not to pinch the loom during the process.
DO NOT allow water to enter the controller, use trap and putty to seal
the connectors. Connecting wires must be securely fixed in place.
Putty
Trap
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Putty
Putty
Trap
Trap