Freeze Protection Heaters - A.O. Smith T-H3J-DV Service Manual

On-demand water heater
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10-17. Freeze protection heaters

Part#
Function
Failure events
Effects on the water heater
if heater fails
Error codes when heater
fails
Diagnostic
Color / Number of wires
The water heater has two types of the heaters in it. The one is for protecting of the heat
exchanger and water pipes, the other one is for protecting of the water inlet and water outlet.
Part# 319143-531 (EK209)
For the heat exchanger
Flat heater
Part# 319143-555 (EK217)
240 (T-H3J), 340 (T-H3S) and 540 (T-H3) models Service Manial
• 319143-531 (EK209)
• 319143-532 (EK210) : Indoor
• 319143-533 (EK211) : Outdoor
• 319143-468 (EK105)
• 319143-535 (EK217)
Prevents the heat exchanger, water valves, and water pipes within the water
heater from freezing. The heaters are but one of the freeze protection
devices in the water heater.
Open circuit failure: Ceramic heaters do not receive the voltage needed to
heat up.
Ceramic heaters do not activate, allowing water contained in the heat
exchanger to freeze up, possibly causing the heat exchanger to burst.
1. Visual inspection: connection/breakage of wires and the condition of the
heaters.
2. Check: whether those are in the normal range as shown in the following
table.
108 to 132 VAC
Black - Black
(during freeze protection operation)
42
Page
Unit Part#
N/A
For the water inlet
and outlet
Part# 319143-468 (EK105)
For the secondary heat exchanger
Part# 319143-532 (EK210) : Indoor models
319143-533 (EK211) : Outdoor models
CONFIDENTIAL
Ver. 1.00
#414
#415
#417
#464
Checkpoint
B1

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