Error Codes - AquaStar 240 FX Installation And Owner's Manual

These 3 listed symptoms and solutions are to be followed when there is a problem but there is NO error
code on the heater or 240TSTAT remote control.
1. Water Isn't Hot Enough
The 240FX can burn gas at a maximum input rate of 165,000 BTUH. This puts a limit on the possible output
temperature and flow capabilities (See flow chart on the last page of this manual). If the water isn't hot enough,
turn down the flow rate through the unit. If it still isn't hot enough, compare the flow and temperature that is
being attained to the 240FX flow vs. temperature chart, see p.22. If the unit is not performing according to the
chart, first check that the gas supply line is sized properly, and that the gas pressure is within the required
range. If the gas line is okay, check the plumbing for mixing valves, thermostatic valves, scald protection, single
handled valves or crossed connections. If the unit is performing in accordance with the flow chart, then it may
be undersized for the application.
2. It Takes Too Long to Get Hot Water
The 240FX takes three seconds to ignite, and three more to get up to temperature. The rest of the time needed
for hot water to get to a fixture is due to the length of piping between the water heater and the fixture. If the unit
seems to be taking longer than six seconds to initiate, check the filter and flow sensor for any debris or damage.
3. The 240FX Will Not Initiate
First check the flow rate through the unit. If the flow is not .75 GPM or greater, the unit will not initiate. Check
the inlet filter screen for debris. Then check for a plumbing crossover in the building. To confirm there is no
crossover in the plumbing, shut off the cold water supply to the 240FX and then open all hot water faucets.
There should not be any water flowing at these faucets. Water running is a sign of a plumbing crossover and it
must be corrected.
Press the lower green button on the GFCI inside the unit. If the red light above it does not come on, then there
is a problem with the electrical supply to the unit. If that light does come on, hit the green reset button above the
light, and look for a small red LED in the lower hole in the middle of the 240FX circuit plate. If this light is not lit,
there is a problem with the electrical connection b etween the GFCI and the circuit plate. Contact CEC for
instructions.

Error Codes

The 240FX is self diagnostic for errors. If there is a problem with the installation, venting or operation of the unit,
it will give a signal, through a pair of flashing lights on the circuit plate, to communicate the source of the
problem. If the unit has a 240TSTAT remote control installed, this will give also a numerical error code. Consult
the following chart on page 19 for the meaning of an error code:
240TSTAT
18