Troubleshooting - Weil-McLain ECO 70 Manual

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AS FIRED WATER BOILER

Troubleshooting

VERIFY PROPER OPERATION AFTER SERVICING VERIFY PROPER OPERATION AFTER SERVICING
Before calling for troubleshooting assistance, fill in
the "
Record the boiler size and CP number (located on the
right side exterior of the boiler jacket).
ELECTRICAL SHOCK HAZARD
. 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 —
LABEL WIRES BEFORE
REMOVING
Label all wires prior to disconnection when servic-
ing controls. Wiring errors can cause improper and
dangerous operation.
90
— Boiler Manual
" (page 122).
1. See Figure 93 for tools and kits recommended for troubleshoot-
ing ECO boilers.
2. Check for 120 VAC (minimum 102 VAC to maximum 132 VAC)
to boiler.
3. Check the ECO control's last three lockout histories. (Navigate to
the DIAGNOSTICS menus.)
-
a. See Figure 71, page 66 for navigation instructions and Fig-
-
b. In the DIAGNOSTICS menu, scroll down to ERRORS and
c. Record the first four data records and then highlight the his-
d. Follow information at the bottom of the screen to navigate
Tool
#2 Phillips screwdriver
10 mm wrench
#20 long-handled Torx
driver
Multimeter
Manometer
(Inclined or digital)
Combustion analyzer
(Digital preferred)
Contact thermometer
Maintenance kit
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 ECO control are securely plugged
in at module and originating control.
4. Gas pressures:
BEFORE TROUBLESHOOTING — BEFORE TROUBLESHOOTING — BEFORE TROUBLESHOOTING —
ure 80, page 72 for the complete Diagnostics menus.
press the enter key.
tory record you want to view.
through your lockout histories.
Tools and kits needed for troubleshooting
Multiple uses
Remove heat exchanger cover plate
Remove burner screws
Measurements on sensors and electrical components
Measure the INLET gas pressure to the boiler
Combustion testing and boiler adjustments
Checking surface temperatures of heat exchanger and
pipes
ALWAYS have this kit on hand when performing main-
tenance in case replacement is required.
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 17 while operating on high fire.
Part number 550-142-122/0513