PrecisionTemp
Cincinnati, Ohio
(513) 641-4446 Fax (513) 641-0733
www.precisiontemp.com
Rev 04/07
13
at the tank (if you have one) may have an orifice that is too small (under 3/16th of an
inch).
6. Check the heater for an airflow obstruction and clean.
7. Check the two conductors, black and white wire to the modulating valve. It should be se-
curely plugged in to the control board terminal.
Water Temperature Is Too Hot Or No Temperature Control.
1. The thermostat is set too high. See "Changing The Temperature setting."
2. Fuel tank regulator is set too high. Have the regulator checked by a qualified technician.
3. Be sure that the hot and cold water lines are not reversed on the heater hook-ups. The
unit will not function properly and water could become extremely hot.
4. If water temperature reaches 165°F, the high temperature limit switch (ECO) will trip,
shutting the heater down. Locate the high temperature switch (two light blue wires) at the
upper right hand of the heat exchanger. Push the reset button in the center of the switch.
(Early models only. Newer models have an auto reset ECO)
Low Heat Rise. Excessive Water Flow Is Required To Trigger Water Heater
If you find that your heater requires excessive flow to activate it (over1/2 gallon per minute), it
is likely that you have cold water bleeding into the hot water side of your water system.
Check that valves and faucets are closed when not in use. If there is an on/off button on your
showerhead, always turn the water valves off after the shower to prevent cold water from
bleeding into the hot water system. This will keep the heater from functioning properly.
If any problem persists, contact an authorized service center or PrecisionTemp.
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