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Troubleshooting suggestions —
Part number 550-100-260/0520
118
ECO
®
Tec
GAS-FIRED WATER BOILER – 80/110/150/199 BOILER MANUAL
Faults
Display Condition Diagnostics Corrective Action(s)
Nothing shown
on display
screen and boiler
will not respond
to call for heat
Control is not receiving 24V
power.
Check wiring for short circuit or
incorrect wiring.
Correct wiring per wiring diagram including connection of
transformer to the control.
Check 3-amp low voltage fuse
on control shown on page115.
Replace fuse with proper part found in replacement part section of
this manual. If fuse blows again recheck wiring per diagram.
Check transformer connection
to the control per wiring
diagram. Check for 24V output
of transformer.
Replace transformer if it is receiving 120VAC, but not outputting
24VAC.
Nothing is
shown in display
screen and no
other boiler
components are
operating
Control is not receiving 120V
power.
Check service switch and/
or circuit breaker to boiler is
turned on.
Turn on service switch to power boiler.
Is there 120VAC at the service
switch?
Troubleshoot and correct the power supply to the service switch.
Check for 120VAC at the line
voltage terminal block located
at J1 on the circuit board.
Correct wiring to circuit board using the wiring diagram in this
manual.
Inspect 4-amp fuse as shown
on page115. Replace if
necessary.
Replace the fuse with proper part found in the replacement part
section of this manual. If fuse blows again recheck wiring per
diagram.
Nothing is
shown on
display screen,
but boiler is
operating
Occurs if the communication
is lost from the control to the
display.
Check for loose connections
and proper pin alignment/
engagement on the control's
plug J14 and the back of the
display circuit board.
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.
Cycle power o and on and
check for operation.
Replace with new display module. See repair parts section for proper
replacement part.
TEMP RISE TOO
QUICKLY
Occurs if supply water
temperature in heat
exchanger rises faster than
10º F per second during the
rst two minutes the burner
is on.
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.
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.
Communication
errors
Occurs if display or main
control communications out
for 30 seconds.
Automatically resets when
communication is re-
established.
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.
Control fault Occurs when micro-
controllers on main board
have a RAM or ROM error.
Check for hardware damages. RAM or ROM errors can be reset with the manual reset option.
If problems persist, replace main board.
Troubleshooting (continued)
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