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7. Water valve parts may be dirty or compo-
nents damaged.
Note: If #4 is OK, skip this.
Water valve and component parts must be totally
free of dirt. In hard water areas, mineral depos-
its can eventually (3-5 years) corrode water valve
parts to a point where they will need replacing.
Note: there is a small bleed hole under the gas
valve at the seam where it is connected to the
water valve assembly. Any sign of corrosion at
this location is a sign that the water valve as-
sembly components need to be replaced im-
mediately.
Water valve for Model 125 (34343)
consists of parts #21107, 32570 and 34542.
Contact service person to service the water valve.
a bad washer at a single lever faucet, incorrect
piping or an automatic mixing valve in the line
which permits hot and cold water to mix in the
plumbing. The crossover will create a back pres-
sure in the system preventing the pressure drop
in the AquaStar - i.e. cold water is entering the
water valve from both sides and the burners will
not come on. To confirm there is no crossover in
the plumbing, shut off the cold water supply to the
AquaStar. Open your hot water taps. There
should not be any water flowing. If there is water
flowing, there is a crossover in the plumbing. This
is a plumbing problem, not an AquaStar prob-
lem. Please contact your plumber.
Attach a multimeter lead on the thermocouple
copper tubing below the head, and attach the other
meter lead on the ends of both the wires. Light
the pilot and take a reading on the meter. If it
reads less than 24 mv, replace the thermocouple.
If the reading is 24 mv or over, the thermocouple
is good.
To test the electromagnet, reconnect the thermo-
couple and take another reading. The reading
should drop to about 14 mv. If it does not, re-
place the electromagnet.
PILOT LIGHTS BUT GOES OUT DURING OR
IMMEDIATELY AFTER HOT WATER USE
1. Thermostat calibration is incorrect
The thermostat is not maintaining the proper
burner output for the water flow and the heat ex-
changer is overheating. When this happens, the
ECO safety trips and shuts off the main gas sup-
ply. After the heat exchanger cools, the ECO re-
sets and the pilot can be relighted. In order to
check the calibration, see page 20. If the ther-
mostat cannot be calibrated properly, it is defec-
tive and must be replaced (see page 21).
MAIN BURNERS DO NOT IGNITE WHEN
HOT WATER IS TURNED ON
1. Pilot is not on.
Light the pilot. See lighting instructions.
2. Pilot lighting push button not turned to
proper position
When the pilot flame is on , be sure that the push
button is released fully and is turned to the right
on the burner position (3 flames symbol).
3. Cold incoming water connection made to
wrong side of heater
Make sure cold water inlet connection is on the
right side of heater when you are facing the heater.
4. Water flow rate at hot water tap is too low.
Note: The AquaStar model 80 requires 3/4 gal-
lons per minute flow to activate the burners. This
is a flow which fills a quart jar in 20 seconds.
5. Cold water inlet screen on heater is dirty.
Remove this screen (M in Figure 2, page 6) and
clean it.
6. Crossover in household plumbing
The AquaStar burner activates when there is suf-
ficient water pressure drop in the AquaStar wa-
ter valve assembly when a hot water faucet is
opened. If there is a plumbing crossover, the
necessary pressure drop in the AquaStar will not
occur. A plumbing crossover can be caused by