Takagi T-M50 - Manual (Page 35)

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GENERAL TROUBLESHOOTING
~ TEMPERATURE and AMOUNT OF HOT WATER ~
PROBLEM POSSIBLE SOLUTIONS
It takes long time to get hot water at
the fixtures.
 The time it takes to deliver hot water from the water
heater 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.
 If you would like to receive hot water to your fixtures
quicker, you may want to consider a hot water
recirculation system. (p. 40)
The water is not hot enough.
 Compare the flow and temperature. See the chart
on p. 51.
 Check cross plumbing between cold water lines
and hot water lines.
 Is the gas supply valve fully open? (p. 29)
 Is the gas line sized properly? (p. 17)
 Is the gas supply pressure enough? (p. 16)
 Is the set temperature set too low? (p. 30,33)
The water is too hot.  Is the set temperature set too high? (p. 30,33)
The hot water is not available when
a fixture is opened.  Make sure the unit has 120 VAC / 60 Hz power supply.
 If you are using the remote controller, is the power
button turned on? (p. 30)
 Is the gas supply valve fully open? (p. 29)
 Is the water supply valve fully open? (p. 29)
 Is the filter on cold water inlet clean? (p. 34)
 Is the hot water fixture sufficiently open to draw at
least 0.5 GPM through the water heater? (p. 30)
 Is the unit frozen?
 Is there enough gas in the tank / cylinder? (for Propane models)
The hot water gets cold and stays
cold.
 Is the flow rate enough to keep the water heater
running? (p. 30)
 If there is a recirculation system installed, does the
recirculation line have enough check valves?
 Is the gas supply valve fully open? (p. 29)
 Is the filter on cold water inlet clean? (p. 34)
 Are the fixtures clean of debris and obstructions?
Fluctuation in hot water temperature.  Is the filter on cold water inlet clean? (p. 34)
 Is the gas line sized properly? (p. 17)
 Is the supply gas pressure enough? (p. 16)
 Check for cross connection between cold water
lines and hot water lines.