Westinghouse 220VWH Manual page 53

EXTERNAL LWCO F22
PUMP ON TIME
TARGET WALL F24
PUMP OFF TIME
GAS PRESSURE F26
PUMP ON TIME
PROGRAM ERROR F31
PUMP OFF
HARD FAULT COND F41
HARD FAULT LWCO F42
This error is generated when the External
Low Water Cut Off is installed and the water
level in the boiler is low.
When this code is displayed, the boiler will
not respond to a demand for heat. The
bottom line of the display indicates the
status of the pump. The pump will remain on
when this error is displayed.
This error is generated when the target wall
fuse has been disconnected or tripped on
boilers 299kBTU or larger, or the target wall
jumper wires are not installed on all other
sizes.
The following switches
equipment that may be installed on boiler.
These devices have indicator lights that
illuminate if tripped.
High gas pressure switch – Trips if there is
excessive gas pressure on the outlet side of
the gas valve and must be manually reset.
Low gas pressure switch – Trips if there is low
gas pressure on the inlet side of the gas valve
and must be manually reset.
There was an error while programming the
control and the memory is corrupt. The
boiler control will not function in this state
and the pump will be off as indicated on
the bottom line. This error only occurs if a
technician is programming the control and
the programming function fails. The only
way to recover from this error is to reprogram
the control. If this error occurs at any time
other than when a technician is servicing
the boiler, the control has failed and must be
replaced by a qualified technician.
This error indicates there is an internal fault
in the circuit within the control connected to
the condensate switch.
This error indicates there is an internal fault
in the LWCO circuit.
IF EXT LWCO is installed:
1. Check boiler feed water system. Ensure it is supplying
make-up water to the boiler system.
2. Be sure 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 wiring for damage and repair
as necessary.
5. Ensure EXT LWCO has power applied to the power
input terminals.
6. Press Reset button on LWCO. If error reoccurs, replace
EXT LWCO.
IF EXT LWCO is NOT installed:
Inspect the jumper from terminals 20 and 21 on the Field
Connection Board for damage or loose connections.
For models 299/301/399:
Check to ensure wires are connected to the target wall
fuse. If wires are not connected, inspect the target wall in
the combustion chamber and replace if damaged.
For all other models:
Check to ensure the jumper wire for target wall is
connected on the control between wire locations X7-8
and X7-18.
1. If an indicator light is illuminated, investigate the
source of the error for that particular switch.
are optional 2. With boiler in service mode, measure the gas pressure
in the supply line with a gas pressure meter. Monitor the
gas pressure during both low and high fire conditions for
correct pressure range.
3. If there are no optional switches or none of the
indicator lights is illuminated on the optional switches,
use an ohmmeter to test each of the switches one at a
time. Turn the power off to the boiler and disconnect the
switch to be tested from the boiler to determine which
has tripped.
When you find the tripped switch investigate the cause
of the fault based on the purpose of the switch.
The control must be reprogrammed. If programming
does not solve the problem, the control must be replaced.
1. Inspect the ground wires for damage or loose
connections.
2. Inspect the condensate wiring for damage and repair
as necessary.
3. Ensure no high voltage wires are routed in parallel with
the condensate low voltage wiring.
4. Replace control.
1. Inspect the ground wires for damage or loose
connections.
2. Inspect the LWCO wiring for damage and repair as
necessary.
3. Ensure no high voltage wires are routed in parallel with
the LWCO low voltage wiring.
4. Replace control.
WHL-053 Rev. 00 Rel. 003 Date 7.21.17
53