Fault Finding - andrews ECOflo EC230/600 Installation Manual, Operation And Maintenance Manual

FAULT FINDING

MAIN POWER LIGHT IS NOT LIT
Make sure that the water heater is plugged in.
When the switch is on, is there 230V between L1 and N
on the terminal block? If not, check for loose wire
connections on the "Power Switch Wire Harness." If
connections are ok, replace the switch.
If there is voltage between L1 and N, the light on the
switch is burnt out. Replace switch.
THERMOSTAT DOES NOT CALL
FOR HEAT
Make sure that the temperature of the tank is cool.
If the thermostat does not call for heat, check the
PRIMARY voltage across the "Transformer". If there is
voltage across the PRIMARY, check the voltage across
the SECONDARY leads of the "Transformer".
Install a jumper wire from N.O. terminal to the COM
terminal on the "Thermostat PC Board." If the thermostat
calls for heat after installing a jumper wire, replace the
"Thermostat Sensor Probe".
If the 'Sensor Probe' is replaced and the unit still does not
operate, check "Potentiometer" for the proper resistance.
If the readings are correct, replace the "Thermostat PC
Board". Otherwise, replace the "Potentiometer."
IGNITION MODULE "POWER" LED
IS NOT LIT
Check for 230 VAC at the ignition module on "230 VAC
IN." If there is voltage, check the secondary (24 volt
terminals) voltage across the transformer as previously
described. If there is no voltage from the secondary plug
from the transformer, replace the transform or wire
harness. If the control has 230 and 24 volt input, replace
the control.
BLOWER DOES NOT ENERGIZE
Check for voltage to the blower leads. If 230 volts is
present, replace the blower. If no voltage is present,
check the blower relay, thermostat/high limit switch and
collector unit switch. If the limit switch trips, call our
technical support department.
FAULT FINDING • SECTION 7
IGNITOR DOES NOT GLOW
Is there voltage to the "Hot Surface Ignitor"? Check for
230VAC to the ignitor from the ignition module when the
ignition LED is lit. If not voltage to the ignitor, replace
ignition control or the ignitor relay.
Check the resistance value across the "Hot Surface
Ignitor". If over 2000 ohms, then replace hot surface
ignitor.
MAIN VALVE DOES NOT TURN ON
Put your hand on the gas valve – can you feel it energize?
If not, check the voltages at the ignition module across
pins MV on the plug GND.
If there is a 24 VAC problem, check to see if the "Rectifier
Harness" is secure. If it is secure, replace the "Gas Valve".
If you can feel the gas valve energize, check the main gas
supply is not in the off position.
BURNER FLAME KEEPS GOING OUT
Is there minimum gas supplied to water heater as stated
on the rating plate? If not, increase the supply pressure to
the water heater.
Measure the mircoAmps through the flame sensor using a
multimeter. Is there at least 4 microAmps? If not, replace
the "Flame Sensor" or flame sensor wire.
THERMOSTAT DOES NOT SATISFY
Is the tank temperature above the temperature set point?
Does the T&P relief valve leak? If yes, replace "Thermostat
PC Board."
BLOWER DID NOT POST PURGE
Check "Pressure Switch" (exhaust pressure switch) as
previously mentioned.
Check "Collector Limit Switch" as previously mentioned.
If the above switches are functioning, please contact the
Technical Support Department at Andrews Water Heaters
for further assistance.
43