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18
Maintenance
WARNING: Turn off the electrical power
supply, the manual gas control valve, and
the manual water control valve before
servicing.
The unit should be checked once a year or as
necessary by a certified and trained technician. If
repairs are needed, the repairs should be done by
a certified and trained technician.
The following systems and parts should be
checked at least once a year:
1. Venting systems
2. Burners
3. Manual operation of the pressure relief valve to
ensure correct operation.
4. Periodic cleaning of the water filter, refer to
figure below.
5. Heat exchanger. Remove the thermistor and
check for a mineral coating . A mineral coating
on the thermistor requires flushing the heat
exchanger with a descaling solution. Scale
build up will void your warranty and shorten the
life of your water heater.
Troubleshooting
Water Isn’t Hot Enough
The T-K1S can burn gas at a maximum input rate
of 190,000 BTUH. This puts a limit on the possible
output temperature and flow capabilities (See flow
chart on the last page of this manual). If the water
doesn’t seem hot enough, compare the flow and
temperature that is being attained to the T-K1S
flow vs. temperature chart. If the unit is not
performing according to the chart, first check that
the gas supply line is sized properly, and that the
gas pressure is within the required range. If the
gas line is okay, check the plumbing for mixing
valves, thermostatic valves, scald protection,
single handled valves or crossed connections. If
the unit is performing in accordance with the flow
chart, then it may be undersized for the
application. If the unit is performing according to
the chart, the output temperature can be adjusted
using the T-K1S.
It Takes Too Long to Get Hot Water
The T-K1S takes three seconds to ignite, and
three more to get up to temperature. The rest of
the time needed for hot water to get to a fixture is
due to the length of piping between the water
heater and the fixture. If the unit seems to be
taking longer than six seconds to initiate, check the
filter and flow sensor for any debris or damage.
The T-K1S Will Not Initiate
First check the flow rate through the unit. If the
flow is not 0.75 GPM or greater, the unit will not
initiate. Check the filter and the flow sensor for
any debris or damage.
Press the lower green button on the GFCI inside
the unit. If the red light above it does not come on,
then there is a problem with the electrical supply to
the unit. If that light does come on, hit the green
reset button above the light, and look for the green
light on the circuit plate at the top left of the unit. If
this light is not lit, there is a problem with the
electrical connection between the GFCI and the
circuit plate. Contact Takagi Industrial Company
for instructions.