Troubleshooting - Takagi T-H2-DV Installation Manual And Owner's Manual

TROUBLESHOOTING

PROBLEM
It takes long time to get
hot water at the
fixtures.
The water is not hot
enough.
The water is too hot.
The hot water is not
available when a fixture
is opened.
The hot water turns
cold and stays cold.
Fluctuation in hot water
temperature.
GENERAL
x The time it takes to deliver hot water from the T H2 DV/T H2 OS
to your fixtures depends on the length of piping between the two.
The longer the distance or the bigger the pipes, the longer it will
take to get hot water.
x If you would like to receive hot water to your fixtures quicker, you
may want to consider a hot water recirculation system. (p. 32)
x Compare the flow and temperature. See the chart on p. 50.
x Check cross plumbing between cold water lines and hot water
lines.
x Is the gas supply valve fully open? (p. 34)
x Is the gas line sized properly? (p. 18)
x Is the gas supply pressure enough? (p. 17)
x Is the set temperature set too low? (p. 37, 38)
x Is the set temperature set too high? (p. 37, 38)
x Make sure the unit gets 120V 60Hz power supply.
x If you are using the remote controller, is the power button turned
on?
x Is the gas supply valve fully open? (p. 34)
x Is the water supply valve fully open? (p. 34)
x Is the filter on cold water inlet clean? (p. 40)
x Is the hot water fixture sufficiently open to draw at least 0.5 GPM
through the water heater? (p. 37)
x Is the unit frozen?
x Is there enough gas in the tank? (for LP)
x Is the flow rate enough to keep the T H2 DV/T H2 OS running? (p.
37)
x If there is a recirculation system installed, does the recirculation
line have enough check valves?
x Is the gas supply valve fully open? (p. 34)
x Is the filter on cold water inlet clean? (p. 40)
x Are the fixtures clean of debris and obstructions?
x Is the filter on cold water inlet clean? (p. 40)
x Is the gas line sized properly? (p. 18)
x Is the supply gas pressure enough? (p. 17)
x Check for cross connection between cold water lines and hot water lines.
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Page
Troubleshooting
SOLUTIONS