Troubleshooting - Weil-McLain Aqua Balance WMB-155 Manual

W
TM
AquaBalance

34 Troubleshooting

VERIFY PROPER OPERATION AFTER SERVICING VERIFY PROPER OPERATION AFTER SERVICING
Before calling for troubleshooting assistance, fill in the
" Boiler Startup Data Collection Sheet
Record the boiler size and CP number (located on the
left side exterior of the boiler jacket).
Failure to adhere to these guide-
lines can result in severe per-
sonal injury, death or substantial
property damage.
ELECTRICAL SHOCK HAZARD
TURN OFF ALL POWER TO THE BOILER WHEN
SERVICING . Internal wiring is still powered when
the switch is off.
DO NOT JUMPER DEVICES
Never jumper (bypass) any device except for mo-
mentary testing.
REINSTALL Jacket door
The boiler jacket door must be securely fastened to
the boiler to prevent boiler from drawing air from
inside the boiler room. This is particularly important
if the boiler is located in the same room as other ap-
pliances. Failure to keep the jacket door securely fas-
tened could result in severe personal injury or death.
BEFORE SERVICING or
MAKING CONNECTIONS —
ALWAYS TURN POWER OFF TO THE BOILER
TO PREVENT ELECTRICAL SURGES, WHICH
CAN DAMAGE BOILER COMPONENTS.
LABEL WIRES BEFORE
REMOVING
Label all wires prior to disconnection
when servicing controls. Wiring errors
can cause improper and dangerous
operation.
Part number 550-100-305/0118
M -
ALL OUNT GAS FIRED WATER BOILER
" (page 132).
—
Boiler Manual
BEFORE TROUBLESHOOTING — BEFORE TROUBLESHOOTING — BEFORE TROUBLESHOOTING — BEFORE TROUBLESHOOTING —
1. Check for 120VAC (minimum 102 VAC to maximum 132 VAC)
to boiler.
2. Check the control for error codes.
3. See Figure 76, page 60 for navigation instructions and the pages
following for the display key identification.
Hold reset button for 20 seconds:
• TS Flashing (parameter)
• Push heating – button
• IN flashing (information)
• Push heating – button
• HI flashing (history/fault)
• Push "Reset" once
• Push + to scroll error codes, refer to error code list Table 3,
page 88.
To exit out, hold reset button for 20 seconds.
Figure 108
Tools and kits needed for troubleshooting.
Tool Purpose
#2 Phillips screwdriver Multiple uses
10mm wrench Remove heat exchanger cover plate
#20 long-handled Torx
Remove burner screws
driver
T-40 Torx driver For gas valve Offset Lowfire adjustment
4mm Allen wrench For gas valve Highfire adjustment
Multimeter Measurements on sensors and electrical components
Manometer
Measures the INLET gas pressure to the boiler
(Inclined or digital)
Combustion analyzer
Combustion testing and boiler adjustments
(Digital preferred)
Checking surface temperatures of heat exchanger and
Contact thermometer
pipes
Check the following:
1. Make sure thermostat is calling for heat and contacts (including
appropriate zone controls) are closed. Make sure all external limit
controls are either installed (and closed) or temporarily jumpered
for testing.
2. Make sure that connectors to control are securely plugged in at
module and originating control.
3. Gas pressures:
• Maximum: 13" w.c. with no flow (gas valve lockup pressure).
• Minimum: 3.5" w.c. minimum values given on page 16 while
operating on high fire.
85