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Water Heater
4. Soak the mixing valve in a hot white vinegar bath and
flush out the tank.
5. Reinstall the mixing valve screen and valve.
9.2 Flushing the Tank
Use this procedure for general flushing of the tank.
1. Turn off the main water supply (the pump or water
hook up source).
2. Remove the drain plug to drain the water from the
tank.
I
If the water drains sporadically or trickles out of
the drain hole, open the P/T relief valve then use
a small gauge wire or coat hanger to remove any
obstructions from the drain hole.
With the tank drained, approximately 2 qt (1.9 L) of
water remains at the bottom of the tank. This water
contains most of the corrosive particles. To remove
these particles, use an "RV Water Heater Flushing
Tool." The wand of this flushing tool allows the water
jet to clean at different angles inside of the tank.
Cleaning at different angles inside of the tank will
suspend and flush the corrosive particles out of the
drain coupling.
3. Continue flushing the tank until the water being
flushed from the drain coupling is draining as clear
water.
4. Replace the drain plug.
9.3 Cleaning the Pressure Switch
Hose, Nipples, and Straw
To clean the pressure switch hose or nipples, use a
toothpick. To clean the pressure switch straw, use a
brush or blow out the straw using air.
EN
9.4 Checking the DSI Control Board
The Water Heater comes factory-equipped with a 2 A
fuse on the DSI control board to protect from wiring
shorts. If the 2 A fuse is blown, the Water Heater will not
operate.
• Check for a short external to the DSI control board.
If there are no electrical shorts or the shorts are
corrected and the problem is still present, replace the
2 A fuse with a mini ATO-style fuse.
Do not install a fuse larger than 3 A.
NOTICE:
If the fuse is good and the unit is inoperative, check
for excessively high voltage to the unit (more than
14 volts) or for low voltage (below 10 VDC) on the
thermostat line.
• Check for intermittent functionality of the DSI control
board. If the DSI control board is experiencing
intermittent functionality, remove the DSI control board
and clean the terminal block with a pencil eraser.
9.5 Inspecting the Burner and
Burner Assembly
Perform the following checks for the main burner and
burner assembly:
• Ensure the main burner and the valve manifold are
aligned with each other.
• Inspect for and remove any debris such as dust or
insect nests in the compartment burner and flue
assembly.
• Inspect the main burner orifice, clean and adjust the
main burner as necessary.
• Spiders, mud wasps, and other insects can build
nests in the burner tube. This will cause poor
combustion, delayed control, or flame outside of the
combustion tube and the burner assembly. Inspect
and clean the burner tube on a regular basis. Run a
flexible wire brush down the burner tube to remove
obstructions, and then clean the burner tube and the
burner assembly.
• For models with air shutters: confirm the air shutter is
open 0.25 in. (6 mm). If not, adjust the air shutter. If
more air is needed for the installation (high-altitude
installations), adjust the opening of the air shutter in
small increments until appropriate.
Maintenance
49
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