Troubleshooting:
C
ONTROLS
M
ADE
E
ASY
™
TACO, INC.,
1160 Cranston Street, Cranston, RI 02920 Telephone: (401) 942-8000 FAX: (401) 942-2360.
TACO (Canada), Ltd.,
6180 Ordan Drive, Mississauga, Ontario L5T 2B3. Telephone: 905/564-9422. FAX: 905/564-9436.
Manufactured by
POTTER ELECTRIC SIGNAL CO.,
St. Louis, MO
Visit our web site at:
http://www.taco-hvac.com
Printed in USA
Copyright 2008
TACO, Inc.
Limited Warranty Statement
Taco, Inc. will repair or replace without charge (at the company’s option) any product or part which is proven defective under normal use within
one (1) year from the date of start-up or one (1) year and six (6) months from date of shipment (whichever occurs first).
In order to obtain service under this warranty, it is the responsibility of the purchaser to promptly notify the local Taco stocking distributor or
Taco in writing and promptly deliver the subject product or part, delivery prepaid, to the stocking distributor. For assistance on warranty returns,
the purchaser may either contact the local Taco stocking distributor or Taco. If the subject product or part contains no defect as covered in this
warranty, the purchaser will be billed for parts and labor charges in effect at time of factory examination and repair.
Any Taco product or part not installed or operated in conformity with Taco instructions or which has been subject to misuse, misapplication, the
addition of petroleum-based fluids or certain chemical additives to the systems, or other abuse, will not be covered by this warranty.
If in doubt as to whether a particular substance is suitable for use with a Taco product or part, or for any application restrictions, consult the
applicable Taco instruction sheets or contact Taco at [401-942-8000]. Taco reserves the right to provide replacement products and parts which
are substantially similar in design and functionally equivalent to the defective product or part. Taco reserves the right to make changes in details
of design, construction, or arrangement of materials of its products without notification.
TACO OFFERS THIS WARRANTY IN LIEU OF ALL OTHER EXPRESS WARRANTIES. ANY WARRANTY IMPLIED BY LAW INCLUDING
WARRANTIES OF MERCHANTABILITY OR FITNESS IS IN EFFECT ONLY FOR THE DURATION OF THE EXPRESS WARRANTY SET
FORTH IN THE FIRST PARAGRAPH ABOVE. THE ABOVE WARRANTIES ARE IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR
STATUTORY, OR ANY OTHER WARRANTY OBLIGATION ON THE PART OF TACO.
TACO WILL NOT BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES RESULTING FROM THE USE
OF ITS PRODUCTS OR ANY INCIDENTAL COSTS OF REMOVING OR REPLACING DEFECTIVE PRODUCTS.
This warranty gives the purchaser specific rights, and the purchaser may have other rights which vary from state to state. Some states do
not allow limitations on how long an implied warranty lasts or on the exclusion of incidental or consequential damages, so these limitations or
exclusions may not apply to you.
Symptom
Possible Cause
Remedy
Boiler will not
fire
No power to LTA-2
Verify that the LTA-2 wiring is correct. Be sure power to boiler is turned on.
Low water level
Make sure that the water level has reached the LTA-2 probe.
Air pocket at LTA-2
probe
Turn off power to the boiler and slowly loosen, but do not remove the LTA-2. Allow any air to escape until
water seeps past the LTA-2's threads. Promptly re-tighten the LTA-2 and apply power to the boiler.
Dirty probe
Fluxes or oils used during the construction of the boiler or installation of system piping can coat the LTA-2
probe, preventing signals from being received by the LTA-2. Add a cleaning solution, (such as water and
trisodium phosphate or consult the boiler manufacturer), to the system. Heat and circulate this solution for at
least one hour before draining and completely flushing the system with clean water. Remove the LTA-2 probe
and thoroughly wipe it with a clean rag. Refill the system and test for proper operation.
Improper ground
Make sure the green ground wire is electrically common to the boiler. Install the green ground wire to an
unpainted/uncoated surface.
Improper wiring
Check all wiring to the LTA-2 and refer to the wiring diagrams. Using a multi-meter, verify that incoming power
is 24 VAC.
Failed control
If the "STATUS" LED blinks RED, the safety circuits in the LTA-2 have detected a failure in the control. To
remove any temporary conditions, turn off power to the LTA-2. After 30 seconds, turn on power to the LTA-2.
If the "STATUS" LED continues to blink RED, the control must be replaced.
Boiler will not
shutdown
Shorted probe
Turn off power to the boiler and remove the LTA-2. Verify that there is at least 1/4" clearance from all metal
surfaces to the metal probe on the LTA-2. Metal from the boiler or piping must not come in contact with the
metal probe on the LTA-2.
Improper wiring
Check all wiring to the LTA-2 and refer to the wiring diagrams. Using a multi-meter, verify that incoming power
is 24 VAC for LTA024 models and 120 VAC for LTA120 models.
Amber
"SERVICE"
LED is on
Dirty probe
Deposits form over time in the system and can coat the LTA-2 probe, preventing signals from being received
by the LTA-2. Remove the LTA-2 and thoroughly wipe it with a clean rag. Refill the system and test for proper
operation. It may be necessary to clean the boiler and piping as noted above.