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Troubleshooting (continued)
Troubleshooting suggestions —
Part number 550-100-260/0520
119
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
Faults
Display Condition Diagnostics Corrective Action(s)
LOW WTR
CUTOFF OPEN
Occurs if internal low water
cuto contacts open.
Manual reset of control if
contacts are open.
Check for low water condition in system. Repair system as necessary
refer to piping section of this manual.
If low water condition does not exist, check Diagnostics — Inputs
screen to view status of Low Water Cuto. If shown as OPEN check
wiring between LWCO and control. If wiring is alright, remove LWCO
and Clean probe. If problem still exist, then replace the LWCO.
RETURN >
SUPPLY
Occurs if a return water
temperature is greater than
the corresponding supply
temperature by 10º F or
more
and burner has been lit for
more than 60 seconds.
Automatically resets when
condition no longer exists.
Verify proper ow direction of the boiler circulator.
Verify proper placement of system sensors. System sensors should be
on system piping not on the boiler loop.
Verify sensors are wired to correct terminal locations.
System sensors may need to be located further away from the boiler
loop connection to the system, if proximity to the boiler loop is
causing sensors to be heated inaccurately.
Boiler Output
sensor
or
Flue sensor
Occurs if dual temperature
sensors values have spread
by more that 10º F.
Automatically resets when
sensors are within 10º F.
Follow procedure for above for SHORT and OPEN sensor conditions
to properly diagnose sensor. If measured resistance values of sensors
convert to temperatures separated by more than 10º F replace the
sensor.
FLUE TEMP
TOO HIGH
Occurs if ue temperature
sensor exceeds 210º F
(Warning) or 220º F
(Lockout).
Automatic reset occurs if
temperature drops below 210º
F for 2½ minutes.
Manual reset is required if the
temperature rises above 220°
F. Reset using manual reset
screen on display.
Follow procedure above for SHORT and OPEN sensor conditions
to properly diagnose sensor. In addition inspect heat exchanger
combustion chamber and ue ways for abnormal wear or buildup.
Inspect vent system for abnormal wear or damage.
Contact Weil-McLain Technical Support.
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