Part number 550-142-058/0811
WM97+
gas
-
fired
water
boiler
—
Boiler Manual
88
Troubleshooting
(continued)
Display
Condition
Diagnostics
Corrective Action(s)
DISPLAY COMM
Occurs when display
communications out for 30
seconds
Automatically resets when
communication is re-
established.
Check for a loose connection at the molex plug on the control and
connection on the back of the display.
LIMIT OPEN
Occurs when manual or
automatic r eset l imit op ens.
Automatic external limit will
reset 2.5 minutes after external
limit device closes.
Manual limit fault must be reset
by choosing Reset Lockout on
the display.
Is there an external safety device connected? If yes, trouble shoot the
external limit to determine and correct the cause that opened the limit.
Also check for loose wiring connections.
Remove the top right electrical cover and inspect the connector.
Ensure a jumper is installed across the MAN LIMIT terminals if not using a
manual reset external limit.
Ensure a jumper is installed across the AUTO LIMIT terminals if not using
a automatic reset external limit.
HIGH TEMP
LIMIT
Boiler temperature sensor
reached High Temp Limit
setting (no higher than 200°F)
Reset using manual reset screen
on display
Verify all isolation valves are open and circulators are programmed into
the control module properly.
The internal boiler circulator can be configured to turn on or off with
DHW and heating zones. Refer to the control module Setup section to
configure these properly for the system.
Verify water pipe is installed correctly per instructions in this manual.
Verify proper circulator sizing for boiler size and system requirements.
See message displayed TEMPERATURE SENSOR and follow procedure for
loose connections.
FLAME FAULT
Occurs when flame is
detected when there should
be no flame
Reset using manual reset screen
on display
Burner may be operating too hot due to incorrect combustion. Inspect
flame and conduct combustion test.
Force boiler into hi-fire. Check flue gases with combustion analyzer and
correct using the maintenance and startup procedure in this manual.
Verify FLAME SIGNAL value quickly goes to zero on the DIAGNOSTICS -
INPUTS screen when the gas valve closes.
Check for flame at burner via flame current with burner off. Turn boiler
off and watch flame through observation port. If flame continues after
shutdown replace gas valve and venturi.
GAS VALVE
FAULT
The control module has
detected a problem with it
gas valve output circuit
Control will do automatic retry;
lockout if retry unsuccessful;
retry 1 hour after lockout —
restart if condition cleared,
but lockout permanently if
condition still present
Requires manual reset if control
is in lockout
Check wire harness connections between gas valve and control module.
Check resistance between control and gas valve.
If lockout reoccurs replace control module.
Troubleshooting
(continued)
Figure 88 Troubleshooting suggestions for WM97+ boilers —
Fault displays, diagnostics and corrective actions
(cont.)
