Heating Element

"However, the device does not work well at all."

The device does not heat the intercom enough? Is this what you mean by "not work?" Can you be more specific?

Can you post the heater's specs here?

What is the heater doing that differs from what it's supposed to be doing? Example: the heater is supposed to raise the interior temperature of the intercom box by 15 °C but is actually raising it by only 5 °C.

Can you supply photo(s) of the heater, as installed, and post them here?

Have you informed the manufacturer?

The more info you supply, the better the answer you will get.

Install a bell.

Like europium said, give us more facts, and we can help better. The light may be a good idea. You might consider a soft plastic cover over the button area, just expose the speaker. Check the voltage requirement of the heater, make sure it is getting enough power.

Hello I would check why the intercom is not working.

It might be moisture on the PCB which prevents the operation. Then you can do what all carmakers do with their electronics - take a clear resin based / isolating paint and spraypaint the electronics board from both sides to prevent leakage currents. There are special products out there - inquire at radio repair shops or electronic components shops.

This migth save heaters and assure operation as well as prevent corrosion. But be careful do not spray over the contacts of switches. Here it is might be a good recommendation to replace the (corroding) simple contacts normally delivered with a solution based on a little magnet, a spring and a reed contact - worked fine in my house since many years

u have a good idea but i think u should build a compartment for ur device and use hot air blower with the same temprature control system. pls. note the selected temperature should be within the acceptable range of the equipment.

Dickson. Abuja Nigeria.

This is faulty device.

High end electronic devices which is MIl standard certified works from -65C to 150C without an issue. Commercially certified deviced needs to work from -25C to 125C and I do not think temperature out side is that low.

This may have to do with quality issue and your father may have taken on ride by the guy who sold this piece of garbage to your dad.

Quick solution if you know which part is effected by cold then use thermal ribbon if you have room or use quartz bulb to heat.

It will be hard to say what and how to do

85/85 is standard test for plastic and for high end plastic circuits they need to pass -25 to 125 C thermal cycle. You cam buy adhesives from any of electronic adhesive manufacturers who can provide you polymeric paste and FR-$ substrate both will meet this requirements

Few company like Global applied Materials in India, Lord Corporation in USA, Able Stick in Germany and Shoie in Japan can provide conductor, resistor and dielectric ink to meet the requirements

Google Raychem

Spammer.

Try installing a 4 watt night light bulb under the electronics panel.Just enough heat to keep it dry and warm, or another bulb of your chosen wattage sufficient to do the job.

If you have 12 volt in that intercom, just mount a 10w auto bulb and let it run during the winter. I think that's the easiest way to fix it. Good luck. Stefan