User Interface Display - Westinghouse 220VWH Manual

50
Label all wires prior to disconnecting them when servicing the
boiler. Wiring errors can cause improper and dangerous operation.
Failure to follow these instructions may result in property damage
or personal injury.
NOTE: If system return temperatures are maintained below the dew
point, condensation will form on the inside of the boiler cabinet and
cause some internal sheet metal components to rust.
D. User Interface Display
Cascade Control Fault Codes
Screen
SYS SUPPLY SENSOR E03
PUMP OFF 12:56P
SUPPLY SENSOR F02
PUMP ON TIME
RETURN SENSOR F03
PUMP ON TIME
FLUE SENSOR F04
PUMP ON TIME
WHL-053 Rev. 00 Rel. 003 Date 7.21.17
Description
E03 indicates a problem with the system
sensor circuit. The circuit could be open or
shorted. Possible reasons for this error are:
There is no system sensor connected to the
Master Boiler.
The system sensor is faulty.
There is a short circuit in the system sensor
wiring; possibly from a staple placed through
the wire, or damage to the wire causing both
conductors to touch.
The system sensor wiring is open due to
defect or damage.
The dual supply sensor contains two
sensing elements within a single body. F02
indicates that one or both halves of the
supply temperature sensor has failed OR the
difference between the dual sensor readings
o
is greater than 18 F. This is a serious safety
issue and the boiler 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 flashing word LOCKOUT.
During this lockout fault, the pump will be
on as indicated on the second line of the
display.
F03 indicates the return temperature sensor
of the boiler has failed. The boiler will not
restart until a technician replaces the sensor
and pushes RESET on the display. This is
a serious safety issue as indicated by the
illuminated red light and the word LOCKOUT
flashing on the display. During this lockout
fault, the pump will be on.
The dual flue sensor contains two sensing
elements within a single body. F02
indicates that one or both halves of the
flue temperature sensor has failed OR the
difference between the dual sensor readings
o
is greater than 18 F. This is a serious safety
issue and the boiler 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 flashing word LOCKOUT.
During this lockout fault, the pump will be
on as indicated on the second line of the
display.
Possible Remedy
Disconnect the system sensor from the wiring and
measure it's resistance. Compare the measured resistance
to the table in this manual to see if it corresponds to the
temperature of the sensor. If the resistance does not
agree with the sensor, replace the sensor. If the sensor
is OK, disconnect the sensor wiring from both the boiler
and the sensor and check continuity using an ohmmeter.
Repair or replace as necessary.
If this error is present, the boilers in the cascaded group
will run and ignite simultaneously when there is a heat
demand. Each boiler will modulate to maintain set
point temperature on its own supply sensor. This code
automatically resets when repair is complete. This code
will not display if system setting function ERROR SYSTEM
SENS is set to OFF.
1. Check the electrical connections to each half of the
sensor on the outlet manifold. Verify 5 VDC by checking in
Molex connector. If there is not 5 VDC, check the harness.
If harness and sensors are OK, replace control.
NOTE: The boiler will reset automatically. Verify sensor
resistance values of each half of the dual sensor by
referencing chart in this manual.
2. Replace thermistor if necessary.
1. Check circulator pump operation.
2. Ensure adequate flow through the boiler by accessing
the status menu and determining there is less than a 50
rise from the return thermistor to the supply thermistor.
3. Troubleshoot thermistor by following the steps in F02.
1. Inspect the dual flue sensor for physical damage,
blockage, or corrosion and replace it if necessary.
2. Check the electrical connection to the dual flue sensor
and repair as necessary. Verify 5 VDC by checking in
Molex connector. If there is not 5 VDC, check the harness.
If harness and sensors are OK, replace control.
NOTE: The boiler will reset automatically. Verify sensor
resistance values of each half of the dual sensor by
referencing chart in this manual.
3. Replace sensor if necessary.
o
F