Problems are stated in upper case, bold face. Most common causes for the problems follow in order of likelihood. The suggested solutions require that the cover be taken off. To do this, remove incandescent particle tray, pull off the temperature adjustment knob and unscrew and remove the plastic collar. Pull main cover out toward you and lift up and out.

NO SPARK AT THE PILOT

1. On/Off switch is not ”On” (Position

 

 

 

).

 

The On/Off switch is located behind the flipdown cover plate on the front panel strip. See fig. 9.

2. Cross over in water lines

To confirm there is no cross-over in the plumbing, shut off the cold water supply to the 125 HX and open all hot water faucets. There should not be any water flowing at any faucets. Water running is a sign of a plumbing cross-over. Consult your service person.

3. Water flow is not sufficient to activate heater.

Water flow rate at faucet is below minimum flow needed to activate heater. When temperature adjustment knob is turned all the way clockwise, the model 125 HX requires 1/2 gallon per minute flow to activate the heater. As a reference, this is a flow which would fill a quart jar in 30 seconds. If the temperature adjustment knob is turned fully counterclockwise, a flow rate of 1.1 gallons/minute is required to activate the heater.

The red LED light (located behind the coverplate on the front panel) flashes when the water flow is not enough.

4. Water inlet filter is clogged

Water flow is restricted, preventing needed flow to activate heater. Clean water inlet filter screen.

5.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 heater.

6.Water valve parts may be dirty or components damaged First check that venturi is free of dirt particles. Water valve and component parts must be totally free of dirt. In hard water areas, mineral deposits can eventually (3-5 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 components need to be serviced immediately.

7.Poor circuit connections at the ECO (overheat sensor) or the flue gas safety device

Ignition sparker will not operate if the electrical circuit is interrupted. Check that the connections to the ECO and Flue Gas Safety Device are secure and tighten if necessary. If the 125 HX is Powervented, check spill switch reset

SPARK APPEARS AT PILOT WHEN HOT WATER TAP TURNED ON, BUT PILOT AND BURNERS WILL NOT IGNITE

1. Air in the Gas Line

Normally this is a problem at time of initial installation, after the pipes have been worked on, or after a gas supply line has been allowed to empty. Bleed the air trapped in the gas line by turning the hot water faucet on and off until the air has been cleared from the line.

2. No gas to the 125 HX

A. Gas cock on gas line may not be open

B. Gas regulator may be shut or damaged. Replace or unlock the regulator. Note: The regulator furnished with the heater is exclusively designed for low gas pressure. Excessive pressure will lock it up. Locking usually happens when using propane gas if the gas pressure between the gas tank and the water heater’s gas regulator has not been reduced. See Page 3 for recommended correct gas pressure. To unlock a regulator, consult your service person.

3. Pilot orifice or gas valve is dirty

Clogging of the pilot burner can be caused by dust in the air or dirt in the gas. The pilot orifice or gas filter may need to be cleaned or replaced.

4.Pilot electrovalve switch may need to be replaced (See Fig 13).

Measure milivoltage at pilot electrovalve (see Fig. 13).

5.Electronic Control Box may need to be replaced (See Fig 13).

Check wire connections and test operation of electronic control box (see Fig. 13).

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AquaStar 125HX LP, 125HX NG specifications No Spark AT the Pilot
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125HX LP, 125HX NG specifications

The AquaStar 125HX NG and 125HX LP are highly efficient gas tankless water heaters designed to meet the demands of modern households. With their compact size and advanced technology, these units provide an endless supply of hot water while maintaining energy efficiency. Both models cater to natural gas and propane applications, making them versatile options for various installations.

One of the standout features of the AquaStar 125HX series is its ability to deliver a powerful output of up to 199,000 BTUs, ensuring that multiple hot water outlets can operate simultaneously without a drop in temperature. Users can enjoy the convenience of hot showers, laundry, and dishwashing all at once, making it an ideal choice for busy families or households with high hot water needs.

These models incorporate a sophisticated modulating gas valve that adjusts the gas flow based on the demand for hot water. This technology not only optimizes energy consumption but also contributes to extended unit life by minimizing wear and tear on the components. The AquaStar 125HX units also come equipped with a patented electronic ignition system, which eliminates the need for a standing pilot light and reduces gas consumption.

Furthermore, the AquaStar 125HX NG and 125HX LP feature a durable heat exchanger constructed from high-grade copper, which enhances thermal efficiency and prevents corrosion. This ensures a longer lifespan and increased reliability for homeowners. Additionally, the units are compact and wall-mounted, allowing for flexible installation in various spaces, including tight utility closets or outside walls.

Safety is also a top priority, with built-in overheat protection and a freeze protection feature that ensures the unit remains operational even in colder climates. The AquaStar 125HX series operates quietly, allowing users to enjoy the benefits of hot water without the disruptive noise commonly associated with traditional water heaters.

In summary, the AquaStar 125HX NG and 125HX LP are leading choices in the tankless water heater market, combining efficiency, reliability, and innovation. Their impressive output, advanced technologies, and compact design make them suitable for modern living, ensuring homeowners have access to hot water whenever they need it. With these features, AquaStar continues to set a high standard in water heating solutions.
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