Weil-McLain WM97+70 Specifications download pdf (Page 102)

Part number 550-142-120/0113

WM97+ gas-fired water boiler — Boiler Manual

– 102 –

Troubleshooting

BEFORE TROUBLESHOOTING —BEFORE TROUBLESHOOTING —

1. See Figure 107 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 WM97+ control’s last three lockout histories. (Navigate

to the DIAGNOSTICS menus.)

a. See see Figure 84, page 74 for navigation instructions and

Figure 93, page 83 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 107

Tools and kits needed for troubleshooting

Tool Purpose

#2 Phillips screwdriver

Multiple uses

10 mm wrench

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 WM97+ control 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 18 while operating on high ﬁre.

VERIFY PROPER OPERATION AFTER SERVICINGVERIFY PROPER OPERATION AFTER SERVICING

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 136).

Record the boiler size and CP number (located on the

inside left side of the jacket above the heat exchanger).

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 135 136

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Weil-McLain WM97+70 Specifications Page 102

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