AquaStar 125FX NG, 125FX LP specifications No Spark AT the Pilot, Microswitch adjustment

PILOT ORIFICE

Fig. 13 - Pilot burner with pilot orifice

Main Burner Flames: The main burner flames should be blue, with a more intense blue cone in the center core. Yellow flames could be a sign of wrong size gas orifices or dirty burners, or a blockage on the heat exchangers fins. If some burners have yellow flames while others have good flames, it is likely that dust, lint or spider webs have partially clogged the burner venturis. To clean the burners, contact a gas service person.

Mineral Scale Build-up: AquaStars, when operated at lower temperature settings, do not accumulate mineral buildup. If however, the heater is used at the higher temperature settings and the water has a high mineral content, periodic descaling may be necessary. The heating coils should be flushed with a descaling solution.

Consult your dealer or service person.

TROUBLE SHOOTING (see maintenance table)

Introduction

The AquaStar 125FX pilot and burners are ignited by a water flow valve. Numerous water related problems can cause this water valve to malfunction such as: Insufficient water flow volume to activate the burners at its minimum flow requirement; Dirt in the water flow valve causing it to malfunction; Sediment build-up in faucet aerators, or shower heads; Uneven pressures between cold and hot with single lever faucets; Plumbing cross overs. These water flow related problems can cause the heater to deliver less than its full output, or to fail to ignite or to shut down completely.

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, pull off the temperature knob and unscrew and remove the temperature knob 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. 10.

2. Bad electrical connections.

Be certain that all electrical connections are clean, tight, and free of any moisture.

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 AquaStar model 125FX 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.

4. Bad fuse

Check the viability of the fuse (see Fig 9 (#9) for location of fuse). Replace if necessary.

5. Water inlet filter is clogged

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

6. Cross over in water lines

To confirm there is no cross-over in the plumbing, shut off the cold water supply to the AquaStar water heater and open a hot water faucet. There should not be any water flowing at that faucet. Water running is a sign of a plumbing cross-over. Consult your plumber.

7. Microswitch needs to be adjusted or replaced.

If you do not hear a click when a tap is opened, the microswitch needs to be adjusted. See Fig. 15 (#11) for location and see Fig. 14 for adjustment. The microswitch may need to be replaced.

			Adjusting screw
	G871 212
	Fig. 14 - microswitch adjustment
	Pilot does not spark with		Pilot	always		sparks
	water flow		without water flow
1	Close water tap	1	Close water tap
2	Remove screw cap and	2	Screw	in	adjusting screw
	unscrew till sparking starts		until it stops sparking
3	Screw in turning one and a	3	Continue		to	screw in
	half turns		turning one and a half
			turns more

8.Cold incoming water connection made to wrong side of heater

Make sure cold water inlet connection is on the right side when you are facing the AquaStar.

9.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.

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