Maintenance and Service
WARNING: Turn off the electrical power
supply, the manual gas control valve, and
the manual water control valve before
servicing.
Do this immediately after installation.
1. Cleaning the Cold-water inlet filter, refer
to figure below.
2. Be sure that all openings for
combustion and ventilation air are not
blocked.
3. Check that the exhaust vent pipe is not
blocked.
4. Check the gas pressure.
5. Keep the area around the water heater
clear. Remove any combustible
materials, gasoline or any flammable
vapors and liquids.
The unit should be checked once a year or as
necessary by a certified and trained technician.
If repairs are needed, any 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 de-scaling
solution. Scale build up will void your
warranty and shorten the life of your water
heater.
Common Trouble Shooting
Water Isn’t Hot Enough
The T-M1 can burn gas at a maximum
input rate of 235,000 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-M1 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 TM-RE10 or with the dipswitches
on the unit.
It Takes Too Long to Get Hot Water
The T-M1 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-M1 Will Not Initiate
First check the flow rate through the unit. If the
flow is not .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
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