Part number 550-142-058/0811
WM97+
gas
-
fired
water
boiler
—
Boiler Manual
82
Troubleshooting
1. See Figure 82 for tools and kits recommended for troubleshoot-
ing WM97+ boilers.
2. Check for 120 VAC (minimum 102 VAC to maximum 132 VAC)
to boiler.
3. Check the control module’s last three lockout histories. (Navigate
to the DIAGNOSTICS menus.)
a. See see Figure 60, page 55 for navigation instructions and
Figure 69, page 64 for the complete Diagnostics menus.
b. In the DIAGNOSTICS menu, scroll down to ERRORS and
press the enter key.
c. Record the first four data records and then highlight the his-
tory record you want to view.
d. Follow information at the bottom of the screen to navigate
through your lockout histories.
Figure 82
Tools and kits needed for troubleshooting
Tool
Purpose
#2 Phillips screwdriver
Multiple uses
7 mm Nut driver
To change the burner
10 mm Nut driver
Remove heat exchanger cover plate
#20 long-handled Torx
driver
Remove burner screws
Multimeter
Measurements on sensors and electrical components
Manometer
(Inclined or digital)
Measure the INLET gas pressure to the boiler
Combustion analyzer
(Digital preferred)
Combustion testing and boiler adjustments
Contact thermometer
Checking surface temperatures of heat exchanger and
pipes
Maintenance kit
ALWAYS have this kit on hand when performing main-
tenance in case replacement is required.
Check the following:
1. Make sure thermostat is calling for heat and contacts (including
appropriate zone controls) are closed. Check for 24 VAC between
thermostat wire nuts and ground.
2. Make sure all external limit controls are either installed (and
closed) or temporarily jumpered for testing.
3. Make sure that connectors to control module are securely plugged
in at module and originating control.
4. Gas pressures:
•
Maximum: 13” (330 mm) w.c. with no flow (gas valve lockup
pressure).
•
Minimum: must be no less than the minimum values given
on page 14.
Failure to adhere to these guide-
lines can result in severe per-
sonal injury, death or substantial
property damage.
ELECTRICAL SHOCK HAZARD
The boiler ON/OFF switch does not turn off all
power to the boiler.
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 front 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 appliances.
Failure to keep the door securely fastened 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 servic-
ing controls. Wiring errors can cause improper and
dangerous operation.
Before calling for troubleshooting assistance, fill in the
“
WM97+ Gas Data Collection Sheet
” (page 107).
Record the boiler size and CP number (located on the
inside left side of the jacket above the heat exchanger).