TROUBLESHOOTING
Most problems are easily remedied by consulting
the trouble-shooting guide. If problems still persist,
contact PrecisionTemp for assistance. Only a
qualified technician should do any work involving
the gas system.
A periodic visual check of the burner flames should
be done by observing the flame through the “peep
hole” in the heat exchanger. There should be blue
flame with minimum or no yellow tipping. There
should be nothing obstructing the flow of
combustion and ventilation air.
Burner maintenance should be performed by a
PrecisionTemp Authorized Service Technician.
NOTE: The heater is dormant until it senses
water flow. When a water tap is turned on to at
least .5 GPM the burner will fire until water flow
is turned off and the heater again goes
dormant.
Heater Does Not Come On When The Water is
turned on. (Power vent not running)
1. Be sure power is on and panel breaker is not
tripped.
2. Check electrical contacts. Be sure the
connector is plugged into board. Using a
voltmeter, check for 12Volts on this connector.
3. Be sure all electrical connectors are secure
and the polarity is correct. (Red wire to positive
terminal).
4. Fuse in power wire might be blown. Replace
fuse.
5. Locate the ECO, high temperature switch (two
red wires) at the upper left hand of the heat
exchanger. Check for open circuit condition.
6. Be sure there is a battery in the system. Never
connect the heater directly to a power converter.
Some converters have circuits that are not pure
DC. This can cause malfunctions or damage to
the heater and is not covered by warranty.
7. Be sure that no water-mixing valve has been left
in the on position or using the shower head as a
shut off. This will permit water to bypass the water
heater and bleed cold water into the hot water
system. Always turn off both hot and cold water
valves after using.
There Is No Ignition When Water Is On (Power
vent is running)
1. Be sure the gas valve at the tank is “On”, there
is gas in the tank and the gas line is purged of all
air.
2. Be sure that flue terminus is not blocked
3. Check that the ignition wire is plugged into the
spark tower on the ignition control and is not
touching anything else.
4. Check flame site hole to see if igniter is sparking
from the probe to the burner. Bend ignition
wire to adjust to proper gap or contact
PrecisionTemp
or your nearest authorized service
representative.
5. Check that there are no cuts or breaks in the
ignition wire. 6. Be sure that the power vent fan
has 12 volts to it when there is water flowing and
there are no obstructions in the flue pipe.
7. Safety vacuum switch may be out of
adjustment. Contact PrecisionTemp or your
nearest authorized service representative.
No Water Flows From Tap When Tap is Turned
on.
1. Be sure that water supply is turned on and that
there are no obstructions.
2. Hot and cold water lines connected to heater
are reversed. Correct by reversing their positions.
Burner Turns On But Temperature Fluctuates
Erratically.
1. May be caused by excessive restriction at the
water outlets, shower heads, aerators or water
strainers. These should be cleaned and any
shower head flow restrictor removed.
2. If temperature fluctuates as the pump cycles, a
pressure accumulator tank is needed in the water
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.
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 to
assure at least .5 GPM of water flow
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 water
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.
