24 • Condensing Models: On-Demand Water Heater Service Handbook
SER
VICE PR
OCEDURE
S
Verifying DIP
Switch Se ngs
Incorrect DIP switch settings can
cause a 031 error code. To verify your
DIP switch settings, see “Dip Switch
Settings” on page 19.
For specific DIP switch settings
related to vent length or high-altitude
installations, refer to the tables
that start on page 19. Additional
information is provided in the
Installation Manual/Owner’s Guide.
Unit Draining and
Filter Cleaning
1. Close the manual gas shut off valve.
2. Turn OFF power to the unit, then
turn it ON again.
3. Wait 30 seconds, then turn OFF
power to the unit again.
4. Close the cold water inlet shutoff valve
(Figure 11).
5. Open nearby hot water faucets.
When the water flow stops, close
all hot water faucets.
6.
IF
the installation includes isolation
valves, follow these sub-steps:
6.1
Place a bucket or pan
underneath each isola on
valve drain port. (There are
two: one on the COLD line
and one on the HOT line.) See
Figure 11.
6.2
Remove the plugs from each
isola on valve drain port,
then open their valves to
drain the water.
7. Place a bucket or pan under the water
filter drain plug (Figure 11).
8. Remove the water filter drain plug
and the water filter.
9.
Clean the filter.
With a small
brush, clean the water filter
of any debris which may have
accumulated. (See Figure 12).
When the filter is clean, reinstall it.
CAUTION: Keep the O-rings in
place during these steps.
10. Replace all plugs and close all drain
valves.
Drain plugs must be hand
tightened only.
Figure 12. Clean the water filter
with a brush.
Figure 11. Drain Plugs.
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SERVICE PROCEDURES
