ProMelt Installation Manual

19
Troubleshooting
Problem Possible Cause Solution
Mat/cable resistance
measurement is outside
the range printed on
the nameplate label.
An analog ohmmeter
(using a moving needle)
was used to take the
reading.
Obtain a digital ohmmeter (multi-meter) able to read 0 to 20,000
(20k) ohms (Ω) and re-measure the resistance.
If measurement shows
an open or short circuit,
the heating cable has
been damaged.
Record resistances between all power lead wires and contact the
manufacturer.
If measurement is just
a little low or high,
air temperature has
affected the resistance.
If possible, place the mat/cable in a room 65-75 °F (18-24°C) and
re-measure after an hour.
The resistance
measurement could be
from more than one
mat/cable.
Disconnect all cables/mats from each other and from controls
and re-measure.
The ohmmeter
(multimeter) is set to the
wrong scale.
If the ohmmeter (multi-meter) has multiple ranges (e.g. 200Ω,
2kΩ, 20kΩ, 200kΩ, 20MΩ) set the range to 200Ω and re-measure.
Snow/ice is not melting. Mat/cable has been
damaged.
Measure mat/cable resistances (see Phase 2) between all power
lead wires as shown in Phase 3 of this manual. If there is an open
or short-circuit damage, record these resistances and contact the
manufacturer.
Ground fault has tripped. Try resetting the ground fault on the circuit breaker ONCE. If it
trips again, do not continue to try resetting it. Check for loose
wire connections in the breaker panel, junction boxes, controls,
etc. Measure mat/cable resistances (see Phase 2) between all
power lead wires as shown in Phase 3 of this manual. If there is
an open or short-circuit damage, record these resistances and
contact the manufacturer.
Incorrect voltage
applied.
Briefly energize the system and use a multi-meter to measure
the voltage between power lead wires of the mat/cable. Check
voltage ratings for each control and cable to make sure they
match. If possible, use an “amp clamp” meter to measure the
current into each mat/cable.
Mats/cables are
connected in series.
Multiple mats/cables must be connected in “parallel”.
System operates
continuously.
Incorrect wiring. Control
was “bypassed”.
Check wire connections. See wiring instructions with control
and in this manual.
Faulty control. Relay is
not opening properly.
Check instructions with the control.
If not qualified to perform electrical installations, it is strongly recommended that a qualified, licensed electrician be
hired to install the heating cables and related electrical components. If problems with the system arise, please consult
the troubleshooting guide below. Any troubleshooting work should be done with the power removed from
the circuit, unless otherwise indicated. Although this troubleshooting guide is provided to assist with problems
experienced with a ProMelt 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 (see contact information on the back cover).