11
BURNERS DO NOT IGNITE WHEN HOT WATER IS
TURNED ON
1. Pilot is not on.
Light the pilot. See lighting instructions.
2. Gas valve button not positioned on Burner Position
Be sure once the pilot flame is on, that after a 15 to 20
second wait, the main burner button ( ) is pushed all
the way in.
3. 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 the heater.
4. Water flow rate at hot water tap is too low.
Note: The AquaStar models 125B”S” require 0.5 gallon
per minute flow to activate the burners. This is a flow which
would fill a quart jar in 30 seconds.
5. Cold water inlet filter on heater is dirty.
Remove filter and clean. This screen filter is located at
the inlet side of the brass water valve (fig. 11, #35). Check
and clean faucet aerators too.
6. Crossover in household plumbing
The AquaStar burner activates when there is sufficient
water pressure drop in the AquaStar water valve assem-
bly — ie. when a hot water faucet is opened. If there is a
crossover in the plumbing, the necessary pressure drop
in the AquaStar will be insufficient, or totally eliminated. A
plumbing crossover can be caused by a bad washer at a
single lever faucet or incorrect plumbing or a mixing valve
in the line, etc. which permits hot and cold water to mix in
the plumbing. The crossover will create a back pressure
in the 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 an Aquastar problem. Please contact your
plumber.
7. Water valve parts may be dirty or components
damaged.
Water valve and component parts must be totally free of
dirt. First check that the venturi is free os dirt particles. 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 mois-
ture 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 125B”S” is part # 8707002380
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 IMMEDIATELY
AFTER HOT WATER HAS BEEN USED
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
Note: If burners don’t shut down immediately when the
hot water is turned off, the heater will overheat and the
ECO will shut-off the gas. Rebuild the water valve assembly
using the repair kit from CEC (part #8 703 406 204).
WATER IS TOO HOT
1. Water flow rate is too low.
Increase the flow rate.
2. Not enough cold water mixing at faucet
Contact your plumber to adjust mixing valves on faucets.
WATER IS NOT HOT ENOUGH
1. Water flow rate is too high.
Decrease the 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
