Troubleshooting
Problem
Solution
Thermostat works but no heat
from the system.
1. Check wiring connections.
2. If GFCI is tripped, reset
thermostat with on/off switch.
3. Check resistances on floor
heating system. See manual for
system.
No display
1. Check wiring connections.
2. Check circuit breaker or
other protection “upstream” of
thermostat.
GFCI is tripped
1. Check wiring connections.
2. Reset thermostat by switching
on/off.
3. Check resistances on floor
heating system. See manual for
system.
Heating occurs at the wrong times
1. Check that the current time and
schedule times are properly set to
AM or PM.
2. On uninsulated concrete
SmartStart may start heating very
early. You may turn this feature off
if not desired.
Err1:Wrong floor sensor
Floor sensor not correct type or
out of range. Check floor sensor
resistance.
Err2:Floor sensor shorted
Floor sensor short-circuited.
Turn off power at breaker. Make
sure wires are not crossed at the
terminals. Or replace sensor. Or
Reset Factory Defaults.
Err3:Floor sensor missing
Floor sensor not attached and
thermostat is in floor sense mode.
Turn off power at breaker and
attach sensor. Or Reset Factory
Defaults.
Err4/Err5:Internal sensor fail
Internal air sensor is faulty. Replace
thermostat or operate in floor
sense mode.
Err6:Internal temp limit
Internal temperature overlimit.
Make sure sunlight is not directed
at the thermostat or other heat
sources in proximity. Make sure
load does not exceed 15 amps.
Otherwise, turn off power at
breaker and contact factory.
Err7:End-of-life
“End-of-life” indication. GFCI will no
longer function correctly or safely.
Reset the circuit breaker or replace
thermostat.
Specifications
Power Supply
120/240 VAC, 50/60 Hz
Maximum Load
15 amps, resistive
Maximum Power
1800 watts at 120 VAC
3600 watts at 240 VAC
GFCI
Class A (5 milliamp trip nominal)
Display Range
32°F to 99°F (0°C to 37°C)
Setting Range
40°F to 99°F (4°C to 37°C)
Accuracy
± 0.9°F (0.5°C)
Environment
Indoor dry location only
Storage Temperature
0°F to 120°F (-17°C to 49°C)
Floor Sensor
Thermistor, 10k NTC type, double-insulated
Memory
Programming retained indefinitely
Current time/day will need reset if power is lost more than 30 minutes.
ETL Listing
Control No. 3037530
Conforms to UL 873, UL 943, CSA C22.2 No. 24, CSA/CAN C22.2 No. 144
Limited Warranty
Watts Radiant warrants this control (the product) to be free from defect in
material and workmanship for a period of (3) years from the date of original
purchase from authorized dealers. During this period, Watts Radiant will replace
the product or refund the original cost of the product at Watts Radiant’s option,
without charge, if the product is proven defective in normal use. Please return
the control to your distributor to begin the warranty process.
This limited warranty does not cover shipping costs. Nor does it cover a
product subjected to misuse or accidental damage. This warranty does not
cover the cost of installation, diagnosis, removal or reinstallation, or any material
costs or loss of use.
This limited warranty is in lieu of all other warranties, obligations, or liabilities
expressed or implied by the company. In no event shall Watts Radiant be
liable for consequential or incidental damages resulting from installation
of this product. Some states or provinces do not allow limitations on how
long an implied warranty lasts, or the exclusion or limitation of incidental or
consequential damages, so the above exclusions or limitations may not apply to
you. This warranty gives you specific legal rights and you may also have other
rights that vary from state to state.
A Watts Water Technologies Company
For Technical Support:
4500 E. Progress Place
Springfield, MO 65803
(417) 864-6108
