How to test the pressure switch of the pellet stove

How to test the pressure switch of the pellet stove

The maintenance of pellet stoves is an operation of fundamental importance: it is important to evaluate their correct functioning and to start a constant cleaning .

Pellet stoves are increasingly in demand, especially in this period, when the cold arrives and you feel the need to heat your home evenly.

Both at the time of installation and maintenance, the evaluation of the operation of the pressure switch is of fundamental importance.

The pressure switch is a safety device that serves to keep the exact evacuation of the fumes from the combustion chamber under control: in the event of malfunctions or problems on the flue, for example, thanks to the pressure switch, auxiliary safety and alarm devices will intervene. .

The pressure switches can have different shapes: they can be recognized in any case by a transparent tube that reaches the fume extraction chamber .

If the air pressure is normal, it starts the pellet loading and the stove turns on; otherwise, if the air pressure is too high or low, it intervenes by switching off the stove.

In these cases it is necessary to verify that:

  • the stove has been cleaned correctly;
  • the flue is free;
  • the pellet stove door seal is intact.

However, if it continues to intervene, it is necessary to test the operation of the pressure switch : to do this it is important to follow the information given in the instruction booklet and to rely on the expert hands of a technician . As a result, it will need to be adjusted correctly .

Pellet stove pressure switch
  • Evaluate the functioning of the pressure switch
  • The pressure switch alarm continues to appear

Evaluate the functioning of the pressure switch

If you prefer to do it independently, you will need to get a continuity tester and wait for the stove to cool down completely, then disconnecting the cable from the electrical socket.

Once the pressure switch has been identified, remove it from its housing, move it to a table and place the continuity tester tips on contacts C (Common) and NO (Norma Open).

The display should show the digit 1 which means Line Broken.

At this point, by blowing and sucking on the clean tube to activate the pressure switch, the Tester measurement should become 0 (the pressure switch works), otherwise it means that it must be replaced with a quality spare part.

To understand its correct functioning, simply blow and suck: it should make a small click.

Pellet stove pressure switch

The pressure switch alarm continues to appear

Generally, if the shutdown has been activated by the pressure switch, a message similar to ” Depr Sic Fail ” will appear on the display followed by an audible alarm:

When the pressure switch and the stove work correctly but the alarm continues , check that the connected tube is blocked and then clean it .

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