SERVICE PROCEDURES
46 • On-Demand Water Heater Service Handbook for 240, 340 & 540 Condensing Models
2. “0” will display on the controller.
(Figure 40.)
3. Scroll to the desired 540 (T-H3) unit
number in the linked system by
pressing the HOT or COLD buon
to scroll up or down. (Figure 40
shows that unit no. 2 is selected.)
NOTE: “0” will yield information
about the linked system as a
whole. “1” will yield informaon
about the parent unit in a Easy-Link
system. “2”, “3”, & ”4” will yield
informaon about each of the 540
(T-H3) models that are installed in
the Easy-Link system. A maximum
of four 540 (T-H3) units can be
linked together in an Easy-Link
System. (A mul-unit controller
can link up to 20 heaters. Refer to
the mul-unit controller manual
for more informaon.)
4. Press the INFO button to select the
desired unit number.
5. When the desired unit number is
selected, press the HOT or COLD
button to scroll to the desired
information (mode number).
Figure 40 shows that mode number
6 is selected. See Table 18, page
47 for a list of mode numbers and
their meanings.
Figure 40
diagnosc mode
Unit no.
Mode no.
Informaon
. This example shows the steps for displaying the outlet temperature for unit 2 in a linked system.
6. Press the INFO button to select
the mode number. The data will be
displayed on the controller. (Figure
40 shows that the outlet water
temperature of this heater is 120
degrees.)
7. To exit diagnostic mode, press and
hold the HOT and COLD buttons
simultaneously for at least five seconds.
NOTE: You may exit diagnostic mode
by pressing the ON/OFF button.
Also, if left alone, the display will exit
diagnostic mode automatically after
30 minutes.
NOTE:
• Although the controller of the parent unit will display the set temperature in an
Easy-Link System, the controller of the child unit will not display the set temperature.
• In an Easy-Link system, the parent heater will always be heater number 1.
Continued on the next page.
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