Operating instructions
14
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 10 (#4) 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. 16 (#1) for
location and see Fig. 15 for adjustment. The microswitch
may need to be replaced.
G871_212
Adjusting screw
Fig. 15 - microswitch adjustment
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 Controlled Energy for instructions.
TROUBLE SHOOTING
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 I).
The On/Off switch is located behind the flipdown cover plate
on the front panel strip. See fig. 11.
2. Bad electrical connections.
Be certain that all electrical connections are clean, tight,
and free of any moisture.
Fig. 14 - Pilot burner with pilot orifice
PILOT ORIFICE
Pilot does not spark with
water flow
Pilot always sparks
without water flow
1
Close water tap 1 Close water tap
2 Remove screw cap and
unscrew till sparking starts
2 Screw in adjusting screw
until it stops sparking
3 Screw in turning one and a
half turns
3 Continue to screw in
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.