ATTENTION! This product does not contain mercury. However, this
product may replace a unit which contains mercury. Do not open
mercury cells. If a cell becomes damaged, do not touch any spilled
mercury. Wearing non-absorbent gloves, take up the spilled mercury
and place into a container which can be sealed. If a cell becomes
damaged, the unit should be discarded. Mercury must not be discarded
in household trash. When the unit this product is replacing is to be
discarded, place in a suitable container. Refer to www.thermostat-
recycle.org for location to send the product containing mercury.
SYMPTOM
POSSIBLE CAUSE
CORRECTIVE ACTION
No heat
(common problems).
1. Batteries installed wrong or dead
2. Blown fuse or tripped
3. Boiler power switch
4. Boiler door or panel properly installed.
Replacing batteries
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to
engage safety interlock or door switch.
No heat.
1. Pilot light not lit.
2. Broken or damaged thermocouple.
3. Loose connection to thermostat or
system.
4. Thermostat not responding
5. Thermostat or heating system requires
replacement or service.
Re-light pilot.
Replace thermocouple.
Have a qualified service person check the
system before replacing thermostat.
Verify thermostat and system wires are
securely attached.
Reset thermostat by pushing reset button on front.
Your boiler manufacturer or service person
can describe how to test the heating system to verify it
is operating correctly. If the heating system is capable of
operation and the no heat condition persists, replace the
thermostat.
Intermittent heat.
1. Boiler lock-out condition.
Many boilers have safety devices that shut
the system down when a lock-out condition
occurs. If the heat works intermittently, contact the boiler
manufacturer or local service person for assistance.
Heat runs constantly.
1. Possible short in wiring
Check each wire connection to the thermostat
to verify it is neatly looped under the terminals.
No extra wire should stick out from under the
terminals.
Troubleshooting
WARNING: Do not use on circuits exceeding specified voltage.
Higher voltage will damage control and could cause shock or
fire hazard.
Do not short out terminals on gas valve or primary control to
test. Short or incorrect wiring will damage thermostat and could
cause personal injury and/or property damage.
Thermostat installation and all components of the system shall
conform to Class II circuits per the NEC code.
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
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
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.
LIMITED WARRANTY STATEMENT
