Troubleshooting
If problems arise with the thermostat, please consult this troubleshooting
guide. If not qualified to perform electrical work, it is highly recommended
a qualified, licensed electrician be hired. Any electrical troubleshooting work
should be performed with the power removed from the circuit, unless otherwise
noted. Although this troubleshooting guide is provided to assist with problems
experienced with a system, results are never guaranteed. Watts Radiant does
not assume any liability or responsibility for damage or injury that may occur
from using this guide. If problems with the system persist, call the manufacturer.
Insert the ends of the floor sensor wire into the terminals marked “SENSOR”
and snug the screws. It does not matter which wire goes into which terminal.
Floor Limit
Consult your floor covering manufacturer for recommended limits).
It is also useful to limit adjustment by users. And it is useful if the
thermostat is being operated in Air Sensing mode (see Sensor
Regulation below) but it is still desired to maintain a minimum floor
temperature regardless of the air temperature.
Default
maximum:
99
ᵒ
F (37
ᵒ
C)
Default minimum:
40
ᵒ
F (4.5
ᵒ
C)
Sensor Regulation
The thermostat is designed to operate best in Floor Sensing mode.
It is also possible to operate in Air Sensing mode with Floor Sensing
limitation. However, make sure to set a proper maximum Floor Limit
temperature (see Floor Limit above) to avoid overheating certain
floor coverings. Also note that internal heating in the thermostat
may affect the air sensor temperature reading.
Floor Sensor
Air Sensor
Default:Floor
Sensor
Calibration
Under special circumstances it may be desired to slightly adjust
the temperature that is displayed for the sensor. Normally this
is not recommended. The display will show the current sensor
temperature and the offset.
±9
ᵒ
F (±5
ᵒ
C)
SmartStart
Allows the thermostat to learn and automatically determine the
best time to begin heating, reaching the setpoint temperature
at the scheduled time. For example, the schedule may have a
“WAKE” start time of 6:00AM to be 82
ᵒ
F (27.8
ᵒ
C) and SmartStart
may begin pre-heating at 5:30AM to reach 82
ᵒ
F by 6:00AM. It will
take a few days to learn.
ON
OFF
Default: ON
Factory Settings
Use with caution! This will clear all programming and settings to
factory condition. This is useful if there are problems or errors
which cannot be corrected.
Problem
Display
Solution
The following are common issues and solutions. A more complete list and more
solutions are on the manufacturer website.
No heat
GFCI
TRIP
Reset by turning thermostat off/on.
Reset by turning circuit breaker off/on.
Electrician: Check for loose wire connections at breaker and
junctions. Check for short-circuit to ground on heating system.
No heat
HEATING
Allow sufficient time. Verify floor is insulated.
Electrician: Check for correct resistance between heating system
power lead wires. Check for correct voltage supplied to heating
system. Check for correct amps drawn by heating system.
No
display
None
Reset circuit breaker.
Check contacts between Power Module and Front Module and
clean with alcohol wipe.
Electrician: Check for loose wire connections at circuit breaker and
junctions. Check for correct voltage between LINE1 and LINE2.
Heating
occurs
a t t h e
wrong
times
HEATING
Check that the current time and schedule times are properly
set to AM or PM.
On uninsulated concrete slab floors the SmartStart feature
may start heating very early. You may turn this feature off
if not desired.
No heat
FLOOR
LIMIT
Check Floor Limit values (see Table 3).
No heat
95°F or
higher
Electrician: Check to make sure only one Floor Sensor is attached.
Error Codes:
An error code may display due to a power glitch or other false issue.
Always:
1. Try clearing the Error code once by turning the thermostat off, resetting the
circuit breaker, and then turning the thermostat back on.
2. Check the contacts between Power Base and Front Module for dirt or damage.
Turn the circuit breaker off and remove the Front Module. Are the contacts bent
or dirty? Try gently cleaning them with a rubbing alcohol wipe. Dirt or oil may
have contaminated them during installation. In most locations this step may be
performed without an electrician since there is no power available.
3. Check that the Mounting Screws are not too tight causing distortion. Turn
the circuit breaker off and remove the Front Module. Back the screws out
until the Power Base is just snug to the wall.
4. Check that both clips at the top are engaged and that the screw at the
bottom is snug.
If these actions and the following do not resolve the issue, turn off the
circuit breaker and contact the manufacturer for direction. Do not continue
using the system to prevent further risk of damage, fire, or electrical shock.
Problem
Display
Solution
No heat
Err1
Floor Sensor may be wrong type.
Electrician: Check floor sensor resistance. See Table 1 in the
Installation section above.
No heat
Err2
Floor Sensor wires may be crossed.
Electrician: Check if the Floor Sensor wires crossed and short-
circuited. Check Floor Sensor resistance (see Table 1 in the
Installation section above).
No heat
Err3
Floor Sensor wires may not be connected.
Check Floor Sensor connections and mounting screws as
stated above.
Electrician: Check if Floor Sensor is attached. If not, attach
and reset the circuit breaker.
No heat
Err4 or
Err5 and
Air
Internal air sensor may be faulty.
Change setting to Floor Sensing mode (see Table 3 above).
No heat
Err6
Internal temperature limit may be exceeded.
Check if sunlight or other heat source is causing added heat
to thermostat.
Electrician: Check if load exceeds 15 amps.
No heat
Err7
Contacts or internal connections may be faulty.
Check connections and mounting screws as stated above.
Reset circuit breaker.
No heat
Err8
Internal device error.
Power Supply
120 / 240 VAC, 50/60 Hz
Maximum Load
15 A, resistive
Maximum Power
1800 W at 120 VAC / 3600 W at 240 VAC
GFCI
Class A (5 mA trip nominal)
Display Range
32
ᵒ
F to 99
ᵒ
F (0
ᵒ
C to 37
ᵒ
C)
Setting Range
40
ᵒ
F to 99
ᵒ
F (4
ᵒ
C to 37
ᵒ
C)
Accuracy
± 0.9
ᵒ
F (0.5
ᵒ
C)
Environment
Indoor dry location only
Storage Temperature
0
ᵒ
F to 120
ᵒ
F (-17
ᵒ
C to 49
ᵒ
C)
Floor Sensor
Thermistor, 10k NTC type, double insulated, Class2
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.
Table 2 -
Settings continued
Specifications
© 2014 Watts Radiant
WARNING: This product contains chemicals known to the State of California to cause cancer
and birth defects or other reproductive harm. For more information: www.watts.com/prop65
