John Wood Takagi - 320H-520H - Manual (Page 30)

30
TROUBLESHOOTING
General
PROBLEM SOLUTIONS
TEMPERA
TURE and
AMOUNT
OF HOT
W
A
TERIt
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 con-
sider a hot water recirculation system. (pg. 24) •
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The water is not hot
enough. Compare the flow and temperature. See the chart on pg. 37.
Check cross plumbing between cold water lines and hot water
lines.
Is the gas supply valve fully open? (pg. 25)
Is the gas line sized properly? (pg. 14)
Is the gas supply pressure enough? (pg. 14)
Is the set temperature set too low? (pg. 28) •
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The water is too hot. Is the set temperature set too high? (pg. 28) •
The hot water is not
available when a fix-
ture is opened. Make sure the unit gets 120 VAC / 60 Hz power supply.
If you are using the remote controller, is the power button turned
on?
Is the gas supply valve fully open? (pg. 25)
Is the water supply valve fully open? (pg 25)
Is the filter on cold water inlet clean? (pg. 29)
Is the hot water fixture sufficiently open to draw at least 1.9 l/min (0.5 GPM (US))
through the water heater? (pg. 28)
Is the unit frozen?
Is there enough gas in the tank / cylinder? (For Propane models) •
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The hot water turns
cold and stays cold. Is the flow rate enough to keep the water heater running? (pg. 28)
If there is a recirculation system installed, does the recirculation line have enough
check valves?
Is the gas supply valve fully open? (pg. 25)
Is the filter on cold water inlet clean? (pg. 29)
Are the fixtures clean of debris and obstructions? •
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Fluctuation in hot
water temperature. Is the filter on cold water inlet clean? (pg. 29)
Is the gas line sized properly? (pg. 14)
Is the supply gas pressure enough? (pg. 14)
Check for cross connection between cold water lines and hot water lines. •
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W
A
TER HEA
TER
Unit does not ignite
when water goes
through the unit. Is the flow rate over 1.9 l/min (0.5 GPM (US))? (pg. 28)
Check for the filter on cold water inlet. (pg. 29)
Check for reverse connection and cross connection.
If you use the remote controller, is the power button turned on? •
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The fan motor is still
spinning after opera-
tion has stopped. This is normal. After operation has stopped, the fan motor keeps running for 35
seconds in order to re-ignite quickly, as well as purge all the exhaust gas out of the
flue. •
Unit sounds abnormal
while in operation Contact the manufacturer at 1-888-479-8324. •
Remote controller:
TM-RE30 (OPTIONAL)
Remote controller
does not display any-
thing when the power
button is turned on. Press the ON/OFF button on the remote.
If the LED lights up:
This is normal. When the unit has not operated for five minutes or more, the
display turns off to converse energy.
If the LED does not light:
Make sure the unit has power supply.
Make sure the connection to the unit is correct.(pg. 18)
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An ERROR code is
displayed. Please see pg. 32. •