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Part number 550-100-260/0520
120
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
Faults
Display Condition Diagnostics Corrective Action(s)
LIMIT OPEN
Occurs if manual or
automatic reset limit opens.
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.
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.
HIGH TEMP
LIMIT
Boiler temperature sensor
reached High Temp Limit
setting.
Reset using manual reset
screen on display.
Verify that high limit setting is at least 10° F above the maximum
target temperature plus the o dierential.
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
congured to turn on or o with each priority. Refer to the Control
Setup section to congure 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.
FALSE FLAME
Occurs if ame is detected
when there should be no
ame.
Reset using manual reset
screen on display.
Burner may be operating too hot due to incorrect combustion.
Inspect ame and conduct combustion test.
Force boiler into high re. Check ue 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 ame at burner via ame current with burner o. Turn
boiler o and watch ame through observation port. If ame
continues after shut down replace gas valve.
GAS RELAY
FAULT 1-4
The control has detected
a problem with gas valve
output circuit.
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.
If lockout reoccurs replace control.
Troubleshooting (continued)
Troubleshooting suggestions —
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