Weil-McLain EcoTec 80 Manual page 125

G -
®
ECO Tec
AS FIRED WATER BOILER
Troubleshooting
Troubleshooting suggestions —
Warnings
Display
Outdoor Outdoor temperature sensor
Sensor
short or OPEN.
Error
Exceeded *Combi Only*
Flow
Rate The Combi block has a flow
rate above the Maximum Flow
Rate for the boiler model.
Target Flue temperature detected
Reduced - Flue between 200°F and 210°F.
Modifies target temperature
to prevent overheating flue.
Target Boiler Outlet sensor detected
Reduced - Boiler above Max Boiler Temp minus
Boiler Out On Diff.
*Can only occur if using
System Supply or DHW Out as
a modulation sensor*
Target Boiler Outlet sensor detected
Reduced - Flow > Boiler Inlet sensor + 50°F.
Modifies Target temperature
to prevent overstressing heat
exchanger.
Clock Fault When the real time clock chip
is unable to be read.
Software Main control and display
Incompatible software are not compatible.
Virtual If Modbus is activating any
Input virtual TT input.
Active
Part number 550-100-260/0520
(continued)
Condition
Will automatically reset if the
condition clears.
Warning only. Max Target Temp is
targeted until Outdoor Temp
is restored, if used for target
adjustment.
Clears warning when the flow rate
is below the Maximum Flow Rate
for the boiler model minus 0.5
GPM.
Clears warning when Flue
temperatures have been below
200°F and the target has returned
to its original setpoint, then 1 hour
of burner run time has elapsed
without the Flue temperature
exceeding 200°F.
Clears warning when Boiler Outlet
sensor is detected below Max
Boiler Temp minus Boiler Out On
Diff.
Clears warning and target
modification when Boiler Outlet
sensor is detected ≤ Boiler Inlet
sensor + 50°F.
When the real time clock chip is
working correctly and has had a
time written to it.
Unit is updated to matching
software.
No virtual inputs are active.
–
80/110/150/199
Diagnostics
Determine which sensors are suspect and measure their
resistance value and compare it to the values shown in
Figure 101, page 115. If the resistance values are incorrect
replace the temperature sensor. Refer to repair parts
section for proper part number.
Check wire harness for loose connections and pin
engagement at sensor connection, chassis mount
connection through control housing, and the control.
Unplug connection at sensor and at control and check
continuity between ends.
If problem persists after checking Items above, replace
control. Refer to repair parts section for kit number.
Check the flow rate through the Combi block of the boiler
and reduce as necessary.
Check flow sensor for damages and voltage readings to
ensure a working flow sensor.
Check the flue pipe for any blockages.
Check the CO2 readings using an analyzer and adjust gas
valve accordingly to match nominal CO2 readings within
manual.
No corrective action required. Boiler is operating normally.
Check water flow through the boiler heat exchanger.
Check circulators for malfunction or wiring issues.
Enter an updated time/date.
+
If problems persist, replace display.
Check software versions for main control and display.
Replace the hardware that is the incorrect software
version.
Check Modbus communication device for virtual TT input
commands.
B M
OILER ANUAL
Corrective Action(s)
125