system preventing the pressure drop in the Aquastar (i.e. cold water is entering the water heater 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 anAquastar problem. Please contact your plumber.
7.Water valve parts may be dirty or components damaged.
First check that the venturi is free from dirt particles. Water valve and component parts must be totally free of dirt. In hard water areas, mineral deposits can eventually (3 to 5 years in hard water areas) corrode the water valve parts to a point where they will need replacing. Any sign of moisture or corrosion at the joint of the water valve and the gas valve is a sign that the water valve assembly components need to be replaced immediately.
Note: Water valve for model 125BL is part # 8707002478 for both LP and NG models. (Contact service person to clean water valve or replace if corrosion is present).
PILOT LIGHT GOES OUT DURING OR AFTER USE
1. Gas pressure too low
Very low gas pressure may be caused by low delivered gas pressure, a jammed gas regulator or undersized gas lines. If the gas lines are undersized, there may still be the specified static gas line pressure. However when the water valve opens,and gas enters the burners, the pressure could drop sharply, causing the pilot flame to go out. Have a gas technician confirm the gas pressure both static and at maximum Btu output. Specifications for your heater are on page 2.
2. Pilot may be dirty or weak
See Page 9 for instructions on pilot maintenance.
3.Burners are not shutting down immediately when hot water is turned off or when a circulator pump has stopped operating
Note: If burners don’t shut down immediately when the hot water is turned off, the heater will overheat and the ECO will
4. Temperature controls are set too high
If unit is plumbed in a recirculating loop system insure that the aquastat or relay for the primary circulator pump is set for no hotter than 140°F. This is necessary to prevent pilot outage due to overheating. The temperature slide control on the 125BL may also need to be lowered to prevent overheating.
WATER IS TOO HOT
1. Gas flow is higher than necessary. Move gas control slide to the left.
2. Temperature (aquastat) control is set too high
If unit is plumbed in a recirculating loop system the aquastat
temperature relay for the primary circulator pump is possibly set too high.
WATER IS NOT HOT ENOUGH
1.Water flow rate is too high. Decrease the flow rate.
2.Gas flow is not optimal Move gas control slide to the right.
3.Temperature (aquastat) control is set too low
If unit is plumbed in a recirculating loop system the aquastat temperature relay for the primary circulator pump is possibly set too low.
4.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 pages 2 for correct gas pressure settings.
5.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.
6.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 “MAIN BURNERS WILL NOT IGNITE...” paragraph #5).
7.Parts in water flow valve are corroded so that the gas passage is not fully opening
Contact your service person or Controlled Energy.
HOT WATER TEMPERATURE FLUCTUATES
1.Cold water is mixing with the hot water between the AquaStar and the outlet (if not being used with a circulator pump)
See #5 under “Burners do Not Ignite When Hot Water Turned On”.
2.Storage in tank (recirculating system) has not fully recovered
Storage capacity in tank is inadequate. Increasing tank size, setting slide control higher for a fast recovery or adding a second 125BL for even a faster recovery is suggested.
3. Insufficient gas pressure
Note required gas pressures (page 2) and consult gas ser- vice person.
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