HTP EL-399NVWH - Manual (Page 66)

66
LP- 346 REV. 3.20.14
Fault Code F03
RETURN SENSOR F03
PUMP ON
This display indicates that the return tempera-
ture sensor of the heater has failed. This code
indicates a serious safety issue and the heater
will not restart until the sensor is replaced by a
technician and he pushes the RESET button on
the display. This situation is indicated by the
red light on the display and the word
LOCKOUT flashing on the display. During this
lockout fault, the pump will be on as indicated
on the second line of the display. 1. Check circulator pump operation.
2. Assure that there is adequate flow through the heater by
accessing the status menu and assuring that there is less than a
50°F rise from the return thermistor to the supply thermistor.
3. Troubleshoot thermistor by following steps in
F02 .
Fault Code F04
FLUE SENSOR F04
PUMP ON
This display indicates that the flue temperature
sensor of the heater has failed. This is a
serious safety issue. The heater will not restart
until the sensor is replaced by a technician and
he pushes the RESET button on the display.
This situation is indicated by the red light and
the flashing word LOCKOUT on the display.
During this lockout fault, the pump will be on as
indicated on the second line of the display. Inspect the flue sensor for physical damage or corrosion and
replace it if necessary. Check the electrical connection to the flue
sensor and repair as necessary. Measure the resistance of the
sensor and refer to the chart in Table 29 of this manual. The
temperature on the chart should be close to the same as the
temperature in the flue. If not, replace the flue sensor.
Fault Code F05
SUPPLY TEMP HIGH F05
PUMP ON
This display indicates that the supply tempera-
ture of the heater is excessive. If accompanied
by the red FAULT light and LOCKOUT flashing
on the display, this code indicates that the
temperature on the supply sensor has
exceeded 230
o F and a serious safety issue
exists. The heater will not restart until the cause
of the excessive temperature is repaired by a
technician and he pushes the RESET button on
the display.
If the FAULT light is not illuminated and this
message is displayed, then the supply tem-
perature of the heater is at or above 210
o F. The
message will clear automatically when the
temperature drops below 194
o F. During the
time that this message or lockout fault is dis-
played, the pump will be on as indicated on the
second line.
1. Check circulator pump operation.
2. Assure that there is adequate flow through the heater by
accessing the status menu and assuring that there is less than a
50°F rise from the return thermistor to the supply thermistor.
3. Check the direction of flow off the heater circulator. (See Piping
Details in this manual.)
4. Troubleshoot the thermistor by following steps in
F02 .
Fault Code F06
RETURN TEMP HIGH F06
PUMP ON
This display indicates that the return tempera-
ture of the heater is excessive. If accompanied
by the red FAULT light and LOCKOUT flashing
on the display, this code indicates that the
temperature on the return sensor has exceeded
230
o F and a serious safety issue exists. The
heater will not restart until the cause of the
excessive temperature is repaired by a
technician and he pushes the RESET button on
the display.
If the red FAULT light is not illuminated and this
message is displayed, then the return tem-
perature of the heater is at or above 210
o F. The
message will clear automatically when the
temperature drops below 194
o F. During the
time that this message or lockout fault is dis-
played, the pump will be on as indicated on the
second line.
1. Check circulator pump operation.
2. Assure that there is adequate flow through the heater by
accessing the status menu and assuring that there is less than a
50°F rise from the return thermistor to the supply thermistor.
3. Check the direction of flow on heater circulator. (See Piping
Details in this manual.)
4. Troubleshoot thermistor by following steps in
F02 .
Fault Code F09
NO FLAME ON IGN F09
PUMP ON
The heater tried to ignite four times during one
heat call and failed. The red FAULT light and
LOCKOUT will flash on the display. This code
indicates a serious safety issue. The heater will
not restart until the cause of ignition failure is
repaired by a technician and he pushes the
RESET button on the display. During this
lockout fault, the pump will remain on as
indicated on the second line of the display. 1. Watch the igniter through the observation window provided.
2. If there is no spark, check the spark electr
ode for the proper .196”
(5.0 mm ± 1mm) gap.
3. Remove any corrosion from the spark electrode and flame
rectifier probe.
4. If there is a spark but no flame, check the gas supply to the
heater.
5. If there is a flame, check the flame sensor.
6. Check any flue blockage or condensate blocks.