Weil-McLain EcoTec 80 Manual page 120

G -
®
ECO Tec
AS FIRED WATER BOILER
Troubleshooting
Troubleshooting suggestions —
Faults
Display Condition
Occurs if manual or
LIMIT OPEN
automatic reset limit opens.
Boiler temperature sensor
HIGH TEMP
reached High Temp Limit
LIMIT
setting.
Occurs if flame is detected
FALSE FLAME
when there should be no
flame.
The control has detected
GAS RELAY
a problem with gas valve
FAULT 1-4
output circuit.
120
–
80/110/150/199
(continued)
Diagnostics
Automatic external limit will
reset 2½ minutes after external
limit device closes.
Manual limit fault must be
reset by choosing Manual
Reset on the display.
Reset using manual reset
screen on display.
Reset using manual reset
screen on display.
Control will do automatic retry;
lockout if retry unsuccessful;
retry 1 hour after lockout —
restart if condition cleared, but
lockout requiring manual reset
if condition still present.
Requires manual reset if
control is in lockout.
B
OILER
Corrective Action(s)
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 Control 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.
Verify that high limit setting is at least 10° F above the maximum
target temperature plus the off differential.
Verify all isolation valves are open and circulators are programmed
into the control properly.
The boiler circulator output and System Pump/Aux. output can be
configured to turn on or off with each priority. Refer to the Control
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.
Burner may be operating too hot due to incorrect combustion.
Inspect flame and conduct combustion test.
Force boiler into high 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 shut down replace gas valve.
If lockout reoccurs replace control.
M
ANUAL
Part number 550-100-260/0520