John Wood Takagi - 240H-340H-540H - Manual (Page 42)

42
Page
TROUBLESHOOTING
GENERAL
PROBLEM SOLUTIONS
TEMPERA
TURE
and
AMOUNT OF HO
T W
ATER
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. 31)
The water is not hot
enough.
• Compare the flow and temperature. See the charts on p. 54.
• Check cross plumbing between cold water lines and hot water lines.
• Is the gas supply valve fully open? (p. 32)
• Is the gas line sized properly? (p. 21)
• Is the gas supply pressure sufficient? (p. 22)
• Is the set temperature set too low? (p. 36-37)
The water is too hot. • Is the set temperature set too high? (p. 36-37)
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 and/or temperature controller, is
the power button turned on?
• Is the gas supply valve fully open? (p. 32)
• Is the water supply valve fully open? (p. 32)
• Is the filter on cold water inlet clean? (p. 41)
• Is the hot water fixture sufficiently open to draw at least 1.9 L/min
(0.5 GPM) through the water heater? (p. 36)
• Is the unit frozen? (p. 40)
• Is there enough gas in the tank / cylinder? (For Propane models)
The hot water turns
cold and stays cold.
• Is the flow rate enough to keep the water heater running? (p. 36)
• If there is a recirculation system installed, does the recirculation line have
enough check valves? (p. 31)
• Is the gas supply valve fully open? (p. 32)
• Is the filter on cold water inlet clean? (p. 41)
• Are the fixtures clean of debris and obstructions?
• Check if the flow rate is too low. (p. 36)
Fluctuation in hot
water temperature.
• Is the filter on cold water inlet clean? (p. 41)
• Is the gas line sized properly? (p. 21)
• Is the supply gas pressure sufficient? (p. 22)
• Check for cross connection between cold water lines and hot water lines.
Troubleshooting
Owner's Guide