68
Boiler Manual
PART 12: TROUBLESHOOTING
(CONTINUED)
flue switch and connect the wires to the new
switch BEFORE running unit.
WARNING: Do not use jumper to remedy
this error. Faulty switch MUST be replaced.
Failure to do so could result in serious injury
or death.
Fault Code PRO
LOW WATER PRESS
PUMP OFF
PRO
Description:
This display indicates that there is low water pres-
sure in the boiler. This code will reset automatical-
ly after the water pressure is high enough for the
boiler to run safely. The second line indicates the
status of the pump. Note that while the water
pressure is low, the pump will be off.
Remedy:
1. Assure that the system pressure is above 10
psig.
2. Check for leaks in the system piping.
Fault Code LOU
24 VOLT LOW
PUMP ON
LOU
Description:
This display indicates that the 24 volt power
supply on the control is damaged or over-
loaded. This code will reset automatically if it is
the result of an overload and that overload con-
dition is removed. The second line indicates the
status of the pump. Note that while 24 volt
power is low, the pump output will be on.
Remedy:
1. Check line voltage. It must be between 100-
128 volts.
2. If available, connect PC and using HTP serv-
ice software check the 24v supply display in
the lower left corner of the screen. The num-
ber displayed here must be greater than 128
and should be no greater than 250. Use this
as a troubleshooting guide as you follow the
steps below.
3. Remove the 10 pin Molex Connector from
customer connection board. If the message
clears, then the problem is with the external
sensor wiring. Examine the external sensor
wiring for shorts to the ground, repairing as
necessary. If the message is still present and
the boiler is so equipped, disconnect the UL
353 low water cut-off to see if the message
clears. Replace the faulty part. Check the low
voltage wire harness in boiler for shorts to
ground.
4. If a message only occurs when the burner
tries to light, check the gas valve for exces-
sive current draw.
5. If a message is present with the low voltage
harness disconnected from the 926 control
board, replace the 926 control board.
Fault Code FL
LOW WATER FLOW
FL
PUMP OFF
Description:
This display indicates that there is low water flow
in the boiler. This code should never be displayed
on the Elite Heating Boiler
®
since there is no flow
switch in this product. This code will display on
VWH products only. This code will reset automat-
ically when the water flow is high enough for the
boiler to run safely. The second line indicates the
status of the pump. The pump should always be
on when this code is displayed. When there is a
demand, the control will start the pump, wait for
the flow switch to indicate flow then try to ignite
the boiler. This display occurs after the pump is
energized for several seconds and the flow is still
too low.
Remedy:
1. Check to see if boiler pump is functioning.
Repair as necessary.
2. Be sure water is flowing in the system.
Check for valves that should be open,
plugged filter screens, etc.
3. Check the flow switch and wiring. Repair as
necessary.
Summary of Contents for EL-110 LP
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Page 49: ...48 Boiler Manual PART 8 FIELD WIRING CONTINUED Fig 8 5 LP 293 J Rev 1 14 10 ...
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Page 88: ... 2003 2010 Heat Transfer Products Inc www HTproducts com LP 293 REV 01 06 10 ...
