Component List - A.O. Smith THR-160 Installation Instructions And Use & Care Manual

Error
Error Type
Code
E428 Flow Sensor - Cascade Only
Flow Control Valve Fault -
E429
Cascade Only.
1. Verify the water heater's opera on is enabled. The heater's UIM will display
the set temperature when enabled. If it is disabled, press the heater's ON/OFF
bu on to enable the heater's opera on.
2. Verify that the heater's water shutoff valves are open.
3. Check the fl ow sensor wires for a short or disconnec on. Correct any loose con-
nec ons and replace any damaged wire/connector.
4. Drain the water heater following Unit Draining & Power Outage sec on in this
manual.
5. Remove the fl ow sensor and inspect for any debris or damage. Replace if need-
ed.
6. Remove and clean the inlet water fi lter.
1. Check the fl ow control valve wires for a short or disconnec on. Correct any loose
connec ons and replace any damaged wire/connector.
2. Remove the fl ow control valve and inspect for any debris or damage. Replace if
needed. First follow the draining procedure in the Unit Draining & Power Outage
sec on in this manual.

COMPONENT LIST

Procedure
Residen al Gas Water Heater Use and Care Guide • 63