AO Smith POWER VENT GAS Manuel D'installation Et D'utilisation page 43

Fault
Code Description
Displayed
E15
E16
E17 Blower speed
abnormal.
E18
E19
E20
Proportional
valve (PV) current
E21
unusual.
E22 Outlet
Temperature
Probe is Open
circuit.
E23 Outlet
Temperature
Probe is Short
circuit.
E24 Inlet Temperature
Probe is Open
circuit.
E25 Inlet Temperature
Probe is Short
circuit.
E26 Tank Temperature
Probe is Open
circuit.
E27 Tank Temperature
Probe is Short
circuit.
E28 Ignition failure.
E29 Outlet water
temperature too
low.
316888-001 Rev. 00 dRaFt Jun 28 245
All manuals and user guides at all-guides.com
Cause
Blower speed is 200RPM
below the target speed for
20 seconds.
Blower speed is 500RPM
above the target speed for 6
seconds.
Machine starts or normal
combustion, but Blower
speed = 0 for last 3sec.
Have Blower's output signal
but the Blower speed = 0 for
last 400ms.
Blower speed stuck > 3000
rpm
Proportional valve Current <
Minimum.
Proportional valve Current >
Maximum.
Outlet Temperature
is < minimum defi ned
temperature.
Outlet Temperature
is > maximum defi ned
temperature.
Inlet Temperature is
< minimum defi ned
temperature.
Inlet Temperature
is > maximum defi ned
temperature.
Tank Temperature
is < minimum defi ned
temperature.
Tank Temperature
is > maximum defi ned
temperature.
After a failure to detect
the fl ame during ignition,
the control will retry the
specifi ed number of times.
After the maximum failed
attempts, this fault is
declared.
Outlet water temperature <=
(setting temperature – 15°C)
for 60 seconds after fl ame
detected.
TABLE 5
www.hotwater.com
Lockout
type
Soft
1. Check the blower wire harness.
2. Change the blower.
3. Change the board.
Soft
1. Check the proportional gas valve
wire harness.
Soft
2. Change the board.
3. Change the gas valve assembly.
1. Check temperature probes wire
harness.
Soft
2. Replace themperature probe.
3. Change the board.
1. Check the igniter wire harness.
2. Check igniter 120Vac voltage
supply during the ignition time.
3. Check the ignition rod. If it looks
Soft dirty clean it using isopropyl alcohol
and a clean cloth.
4. Check the high voltage wiring
connection between igniter and
igniter rod for proper contact.
1. Check the outlet temperature probe.
2. Change the board.
Alert
Remedy
43