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Troubleshooting
US
Copyright
6 720 646 951 (2011/09)
Water flow too low
There are restrictions in the
plumbing
Obstructions in the water path can restrict the flow of water through the heater.
Verify the heater’s inlet filter screen, faucet aerators, showerheads and whole
house filters are clear of debris. Verify proper flow on the outlet side of the heater
with the hot water pipe disconnected. Maximum flow rates for each unit are as
follows. WH17 = 2.3gpm, WH27 = 3.5gpm.
Water supply pressure too
low
Verify incoming water supply is at least 30psi. For people on well systems, the
recommended pressure range is 30-50psi.
Outlet shut-off valves are set
too low
Adjust installer supplied outlet valve as described below:
•
Completely open both installer supplied inlet and outlet shut-off valves at the
heater. (if none installed, install before proceeding).
•
Completely open hot water on the highest flowing hot water fixture served by
the heater (i.e. bathtub).
•
Slowly close the outlet shut-off valve, slowing the water flow rate until the
temperature at the hot water faucet corresponds to the values given on Fig. 11
of the manual, or desired water temperature is reached.
Tab. 12
Water Temperature too Hot
Temperature dial set too
high
Turn the temperature knob located on the bottom of the water heater
counterclockwise for cooler temperatures.
There are restrictions in
the plumbing
Obstructions in the water path can restrict the flow of water through the heater
causing overheating. Verify the heater’s inlet filter screen, faucet aerators,
showerheads and whole house filters are clear of debris. Verify proper flow on the
outlet side of the heater with the hot water pipe disconnected. Opening hot water
isolation valve fully may be necessary. Maximum flow rates for each unit are as
follows. WH17 - 2.3gpm, WH27 - 3.5gpm.
Inlet water temperature is
too warm
Verify the heater is being feed with cold water only. This water heater is not
designed for preheated water or recirculation applications. Increase flow rate where
ever possible. Replacing low flow showerheads and aerators with higher flowing
(GPM) ones may be necessary.
Tab. 13
