PrecisionTemp
Cincinnati, Ohio
(513) 641-4446 Fax (513) 641-0733
www.precisiontemp.com
Rev 04/07
12
Heater Turns On But Temperature Fluctuates Erratically.
1. Hot and cold water lines are reversed on back of heater. If the flow meter rotor is not ro-
tating counterclockwise, pipes are connected in reverse. Be sure hot water is connected
to bottom fitting and cold to the top fitting.
2. May be caused by excessive restriction at the water outlets, showerheads, aerators or
water strainers. These should be cleaned and the any showerhead flow restrictor re-
moved as defined in “Recommendations for Water System Installation”
3. The VariFlame gas modulating valve is out of calibration. Consult PrecisionTemp.
Heater Does Not Ignite When Water Is Turned On
The gas flow may be too low due to an improper gas line diameter (under 3/8 inch outside di-
ameter). The gas line may be excessively long (over 20 feet) or the on/off solenoid at the
tank (if you have one) may have an orifice that is too small (under 3/16th of an inch).
Heater Comes On But Rapidly Cycles On And Off.
1. Water flow is too low. Increase flow at a tap. Clean all aerators and shower head screens.
2. Water pump is not functioning properly. Repair or replace pump.
3. If the heater cycles as the pump cycles, a pressure accumulator tank is needed in the wa-
ter system. If you have an accumulator tank, check to see if it has become filled with
water. If it has, drain it so that it contains air only.
4. Air is in the water line. Bleed air by turning on all water taps.
Heater Ignites But Water Temperature Is Too Low
1. Check thermostat setting. See "Changing The Temperature Setting"
2. The water flow may be so high as to exceed the capacity of the heater particularly if your
supply water is very cold. Slow the water flow.
3. The heater may be subjected to excessively strong winds, cutting the efficiency. Shield
from wind or change the location of the unit.
4. The gas pressure may be too low. Check the regulator pressure. The LPG pressure
should be 11 water column inches, (WCI) while the heater is running. A gas-testing
gauge should be installed on the manifold tap so that it may be read while heater is run-
ning. If it is too low, turn up the gas regulator to the proper pressure. Be sure the gas
flow control valve is in full “on” position. This should only be done by a qualified techni-
cian.
5. The gas flow may be too low due to improper gas line diameter (under 3/8 inch outside
diameter). The gas line may be excessively long (over 20-30 feet) or the on/off solenoid
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