Westinghouse 220VWH Manual page 52

52
FALSE FLAME SIG F11
PUMP ON TIME
FAN SPEED ERROR F13
PUMP ON TIME
FLUE LIMIT F17
PUMP ON TIME
CONDENSATE FULL F20
PUMP OFF TIME
LOW WATER BOILER F21
PUMP OFF TIME
WHL-053 Rev. 00 Rel. 003 Date 7.21.17
There is flame when the control is not telling
the boiler to run. This is a serious safety issue
as indicated by the illuminated red light and
the word LOCKOUT flashing on the display.
The boiler will not restart until a technician
determines and repairs the cause and
pushes RESET on the display. During this
lockout fault, the pump will be on.
The fan is not running at the speed
determined by the control. Fan speed has
been more than 30% faster or slower than
the commanded speed for more than 10
seconds. This is a serious safety issue as
indicated by the illuminated red light and
the word LOCKOUT flashing on the display.
This boiler will not restart until a technician
determines and repairs the cause and
pushes RESET on the display. During this
lockout fault, the pump will be on.
F17 indicates the boiler flue temperature is
excessive. When accompanied by the red
FAULT light and LOCKOUT flashing on the
display, this code indicates the flue sensor
temperature has exceeded 210
serious safety issue exists. The boiler will not
restart until a technician determines and
repairs the cause of excessive temperature
and pushes RESET on the display.
The condensate trap is full. This is a serious
safety issue as indicated by the illuminated
red light and the word LOCKOUT flashing on
the display. The boiler will not restart until a
technician determines and repairs the cause
and pushes RESET on the display. During
this lockout fault, the pump will be off.
Water level in the boiler is low.
1. Look into window. If there is flame, turn the gas off to
the unit at the service valve and replace the gas valve.
2. If the flame signal on the status menu is greater than
2.5uA when the burner is not lit, replace the spark ignitor.
3. If the flame signal is not present after turning off the
gas supply, check the gas valve electrical connection.
4. Check for condensate backup. Repair condensate
system as necessary. If condensate has partially filled
the combustion chamber, the refractory wall may be
damaged and should be replaced.
5. Turn the gas on at the service valve after corrective
action is taken.
6. If the refractory wall falls against the spark ignitor, it
may conduct the signal to ground, giving a false reading.
1. Check the combustion fan wiring.
2. Measure DC voltage from the red fan wire to ground
while it is connected to the fan. It should be between 24
and 40 volts. If it is lower than 24 volts, check for excessive
external loads connected to the boiler sensor terminals
3. Disconnect the 5 pin plug from the fan and check the
voltage on the red wire again. If it is now between 24-40
volts, replace the fan. If it is still below 24 volts replace the
boiler control board.
1. Check the flue for obstructions and any sign of damage,
especially signs of excessive heat. Repair as necessary.
2. Run the boiler and check the flue temperature with
an external thermometer. If the flue temperature on the
thermometer does not agree with the flue temperature
o
F and a displayed in the status menu, inspect the wiring to
the flue temperature sensor in the boiler and repair as
necessary. If the wiring is intact replace the flue sensor.
3. If the flue temperature is excessive on the status menu
and the test thermometer reads the same, check and
adjust combustion controls on the boiler.
1. Check condensate lines for obstructions.
2. Check float switch in condensate reservoir.
3. Check wiring from condensate reservoir to 928 control
and repair as necessary.
1. Check boiler feed water system to be sure it is supplying
make-up water to the boiler system.
2. Ensure all air is bled from the system.
3. Check for leaks in the boiler and system piping and
repair as necessary.
4. Inspect low water cut off probe and wiring for damage
and repair and replace as necessary.
5. Ensure LWCO jumper is intact and properly installed if
boiler does not have an installed external LWCO.