11
INSUTE202NP1215
PROBLEM
DEFECTIVE PART OR PART TO CHECK
The thermostat is hot.
• In normal operating conditions, the thermostat hous-
ing can reach nearly 40°C at maximum load. That is
normal and will not affect the effective operation of the
thermostat.
Heating is always on.
• Check if the thermostat is properly connected. Refer to
the installation section.
Heating does not run even
if the thermostat indicates
it is on.
• Check if the thermostat is properly connected. Refer to
the installation section.
The display does not turn on.
• Check if the thermostat is properly connected. Refer to
the installation section.
• Check the power supply at the electrical panel.
• Check if the heating unit has a switch. If so, ensure that
this switch is turned on.
The display turns off a few
minutes and then turns
on again.
• The thermal protection of the heating unit has opened
due to overheating. Check if the heating unit is in good
condition of operation and that clearance around the ap-
pliance is according to the manufacturer’s specifications.
The display has low contrast
when heating is on.
• The load is lower than the minimum load. Install a heating
unit that is within the load limits of the thermostat.
The displayed ambient
temperature is incorrect.
• Check the presence of an air stream or a heat source
near the thermostat, and correct the situation.
The display indicates E1, E2,
E3 and E4.
• Faulty thermal sensor. Contact the customer service.
Weak luminosity of the
display.
• Possibility of a bad contact. Check thermostat wirings.
Refer to the installation section.
N.B. If you are unable to solve the problem after having verified these points, please communicate
with our customer service. Consult
www.stelpro.com
for the phone numbers.
TROUBLESHOOTING
