Weil-McLain EcoTec 80 Manual page 118

G -
®
ECO Tec
AS FIRED WATER BOILER
Troubleshooting
Troubleshooting suggestions —
Faults
Display Condition
Nothing shown Control is not receiving 24V
on display
power.
screen and boiler
will not respond
to call for heat
Nothing is Control is not receiving 120V
shown in display
power.
screen and no
other boiler
components are
operating
Nothing is Occurs if the communication
shown on
is lost from the control to the
display screen,
display.
but boiler is
operating
TEMP RISE TOO Occurs if supply water
QUICKLY
temperature in heat
exchanger rises faster than
10º F per second during the
first two minutes the burner
is on.
Communication Occurs if display or main
errors
control communications out
for 30 seconds.
Control fault Occurs when micro-
controllers on main board
have a RAM or ROM error.
118
–
80/110/150/199
(continued)
Diagnostics
Check wiring for short circuit or
incorrect wiring.
Check 3-amp low voltage fuse
on control shown on page 115.
Check transformer connection
to the control per wiring
diagram. Check for 24V output
of transformer.
Check service switch and/
or circuit breaker to boiler is
turned on.
Is there 120VAC at the service
switch?
Check for 120VAC at the line
voltage terminal block located
at J1 on the circuit board.
Inspect 4-amp fuse as shown
on page 115. Replace if
necessary.
Check for loose connections
and proper pin alignment/
engagement on the control's
plug J14 and the back of the
display circuit board.
Cycle power off and on and
check for operation.
Automatically resets after 1
minute delay or using manual
reset on display.
Manual reset is necessary
after 5 automatic resets have
occurred during the same
Priority heat demand. Reset
using manual reset screen on
display.
Automatically resets when
communication is re-
established.
Check for hardware damages.
B
OILER
Corrective Action(s)
Correct wiring per wiring diagram including connection of
transformer to the control.
Replace fuse with proper part found in replacement part section of
this manual. If fuse blows again recheck wiring per diagram.
Replace transformer if it is receiving 120VAC, but not outputting
24VAC.
Turn on service switch to power boiler.
Troubleshoot and correct the power supply to the service switch.
Correct wiring to circuit board using the wiring diagram in this
manual.
Replace the fuse with proper part found in the replacement part
section of this manual. If fuse blows again recheck wiring per
diagram.
Check for continuity on the wire harness from the display to the
communications board to circuit board. See repair parts section for
proper replacement part.
Replace with new display module. See repair parts section for proper
replacement part.
Verify water pipe is installed correctly per instructions in this manual.
Verify proper circulator and speed for boiler size and system
requirements.
See message displayed TEMPERATURE SENSOR and follow procedure
for loose connections.
Improper connections may display the incorrect model numbers.
Check for a loose connection at the molex plug on the control and
connection on the back of the display.
RAM or ROM errors can be reset with the manual reset option.
If problems persist, replace main board.
M
ANUAL
Part number 550-100-260/0520