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136 720 606 804 (02.10)
Fig. 13 - Electrical wiring diagram
5. Flue gas safety device tripped
Ventilate the room and re-ignite the appliance 10 minutes
later. If it happens again, contact your service person or
Controlled Energy..
WATER IS TOO HOT
1. Temperature Selection too high
Turn the temperature adjustment knob counter-clockwise
(to the left) to lower the maximum water temperature.
Note: This will increase the activation flow rate.
2. Inlet water temperature is too hot (as with solar
preheated water or high ground water
temperatures)
Decrease gas pressure. Note: Only the Model “S”
AquaStar should be used if the inlet water is preheated.
WATER IS NOT HOT ENOUGH
1. Temperature selection too low.
Change the setting. Turn the temperature adjustment knob
clockwise (to the right).
Note: This will decrease the activation flow rate.
2. Btu input is too low due to insufficient gas pressure
It is extremely important for a tankless
instantaneous water heater to have the right size
gas line to obtain the correct gas pressure
See specifications on page 2. Unlike storage tank water
heaters, the burners of a tankless water heater must be
very powerful to heat water instantaneously since they do
this only at the time hot water is actually being used. It is
therefore imperative that the gas pressure requirement
be met exactly. Insufficient gas pressure will directly affect
the water temperature at the time of usage. See page 2
for correct gas pressure settings and fig. 4 for locations
where gas pressures are taken.
3. Btu input is too low due to insufficient gas supply
Make sure your main gas line is fully opened. If using LP
gas, be sure that the size of the propane tank is adequate
to supply the required gas pressure.
4. Cold water is mixing with the hot water between
the AquaStar and the outlet
Compare water temperature at outlet of the AquaStar (hold
the AquaStar’s outlet pipe with your hand) and at the tap.
If these two are very different, check for mixing valve or
plumbing crossover (see “NO SPARK AT THE PILOT”
paragraph #4). Where automatic “anti-scald” valves are
required by code, lower the temperature setting on the
AquaStar as much as possible and balance the pressure
between cold and hot water after the AquaStar.
5. Parts in water flow valve are corroded so that the
gas passage is not fully opening.
Contact your service person or Controlled Energy.
PILOT LIGHTS BUT BURNERS WILL NOT COME ON
1. Confirm water valve assembly is working properly.
2. Confirm the flame sensor is in its proper position.
3. Confirm the burner electrovalve switch is
functioning properly.
Call CEC
4. The Electronic Control Box (Fig. 13) may need to
be replaced.
Call CEC.
8 electronic control box
9 LED failure indicator
10 LED indicator main
burner operation
11 on/off switch
12 hydro-generator
13 flue gas safety device
1 burner electrovalve
2 gas control valve
3 pilot electrovalve
4 flame sensor
5 pilot electrode
6 overheat sensor
7 temperature limiter
MAIN BURNERS GO OUT DURING HOT WATER USE
1. Flow rate diminished below activation rate
2. Unbalanced pressure in the water lines
The added restriction caused by the AquaStar in the hot
water system can result in uneven pressures between the
cold and the hot. In such cases when mixing cold water at
the tap, the lower hot water pressure may be overpowered
by a much higher cold water pressure, which may cause
the AquaStar burners to shut down. Make sure faucet
aerators and showerheads are free of minerals and dirt.
Do not add any flow restrictor to the shower head.
3. Minimum inlet pressure on well is inadequate
Check the inlet water pressure. On a private well, raise the
minimum pressure setting to 30 psi. Confirm that the
pressure tank is not water logged.
4. ECO (overheat sensor) tripped due to overheating
re-ignite the appliance 10 minutes later. If it happens again,
contact your service person or Controlled Energy.