Why the plugs are knocked out when turning on the refrigerator: reasons and what to do

You turned on the refrigerator, and suddenly the lights in the apartment went out - the plugs were knocked out again. The situation is familiar to many, but not everyone knows that a serious malfunction may be hidden behind it. If the refrigerator regularly knocks out the circuit breaker in the electrical panel, you cannot ignore the problem: this is not only a risk of being left without refrigeration of food, but also a potential threat of fire or damage to other equipment.

In this article we will analyze 7 main reasonswhy the refrigerator knocks out plugs when turned on - from a banal network overload to breakdowns of the compressor or start relay. You will learn how to diagnose the problem yourself, when you can do without a technician, and in which cases urgent repairs are required. We will also give step-by-step instructions for checking the electrical network, sockets and internal components of the refrigerator.

Important: if the plugs are knocked out every time when starting the refrigerator, do not try to turn it on again - this may worsen the breakdown. First, figure out the reason!

1. Electrical network overload: why the refrigerator does not “pull” the automatic machine

The most common reason for knocking out plugs is exceeding the permissible load on the line. Modern refrigerators (especially with the system) consume from 100 to 600 W, but when the compressor starts, the starting current can reach 5–10 times higher than the rated one! If other powerful appliances are connected to the same outlet (microwave, electric kettle, washing machine), the machine operates as protection. No Frost) consume from 100 to 600 W, but when starting the compressor the starting current can reach 2–3 kW - 5–10 times higher than nominal! If other powerful appliances (microwave, electric kettle, washing machine) are connected to the same outlet, the machine works as protection.

How to check:

• 🔌 Disconnect from refrigerator sockets and all other appliances. Try turning it on separately.
• 📊 Look at the rating of the machine in the panel (usually 10–16 A for household networks). If it is designed for 10 A (2.2 kW), and the refrigerator + other equipment exceed this threshold, the plugs will be knocked out.
• 🔍 Inspect the outlet: melted contacts or a burning smell indicate overheating.

Solution:

• 🔧 Connect the refrigerator to a separate outlet that is not loaded by other appliances.
• 🛠️ If the problem repeats, replace the machine with 16 A (but no more - this can be dangerous!).
• ⚡ Install voltage stabilizer for the refrigerator - it will smooth out current surges during startup.

⚠️ Attention: if the panel contains a machine with a capacity of 25 A or higher, and the wires in the wall are thin (cross-section less than 2.5 mm²), replacing the machine with a more powerful one can lead to fire! In this case, a complete replacement of the wiring is required.

2. Compressor malfunction: when the motor is “jammed” or burned out

The compressor is the “heart” of the refrigerator, and its breakdown often leads to knocked out plugs. Main symptoms:

• 🔊 Typical thud or humming when trying to start, after which the machine is triggered.
• 🔥 Burning smell or smoke from the back of the refrigerator.
• 🌡️ The refrigerator does not cool, but the light inside is on.

Causes of compressor failure:

How to diagnose:

1. Disconnect the refrigerator from the mains.
2. Remove the back cover (if there is one) and inspect the compressor. There should be no traces of melting or oil drips on it.
3. Test the windings with a multimeter (the resistance between the contacts should be in the range of 20–50 Ohms). If the device shows 0, there is a short circuit.

How to ring a compressor with a multimeter?

To check, unplug the refrigerator, remove the cover from the compressor and disconnect the wires from the terminals. Set the multimeter to resistance measurement mode (200 ohms). Measure the resistance between pairs of contacts one by one: C-P, C-C, P-C. Normal values: C-P and C-C — 20–50 Ohms, R-S —the sum of the first two. If at least one value is 0 or infinity, the compressor is faulty.

⚠️ Attention: if the compressor is “jammed”, do not try to turn on the refrigerator repeatedly - this may lead to fire or damage to the start relay. It’s better to call a specialist right away.

3. Failure of the starting or protective relay

The starting relay is responsible for starting the compressor, and the protective relay is responsible for turning it off when overheated. If the relay is burned out or “stuck,” it can cause a short circuit or network overload.

Signs of a relay malfunction:

• 🔊 Clicking sounds from the relay when trying to start, after which the plugs are knocked out.
• 🔄 The refrigerator turns on, but after a few seconds turns off (the cycle repeats).
• 🔥 Darkening or melting of the relay housing.

How to check:

1. Disconnect the refrigerator from the network.
2. Remove the cover of the start relay (usually attached to the compressor).
3. Inspect the contacts: if they are blackened or melted, the relay must be replaced.
4. Test the relay coil with a multimeter (resistance should be 50–100 Ohms).

Solution:

• 🛠️ Replace relay to a similar one (the model is indicated on the case).
• 🔧 If the relay is working properly, check the compressor contacts - there may be a problem with them.

4. Short circuit in the refrigerator wiring

If the plugs are knocked out instantly when you turn on the refrigerator (even without starting the compressor), the reason may lie in a short circuit (short circuit) inside the device. Most often, a short circuit occurs:

• 🔌 In the power cord (frayed insulation, broken core).
• 🔌 In a plug or socket.
• 🔌 In the internal wiring of the refrigerator (for example, due to moisture).

How to find a short circuit:

1. Disconnect the refrigerator from the network.
2. Inspect the power cord for damage. Pull it - if the plug dangles, there may be a broken wire inside.
3. Ring the cord with a multimeter in the “testing” mode. If the appliance beeps when touching any two contacts of the plug, a short circuit has been confirmed.
4. If the cord is working, disassemble the refrigerator and check the internal wiring (especially at the connections to the compressor, lamp and thermostat).

Solution:

• 🔧 Replace the power cord (cost - from 300 rubles).
• 🛠️ If the short circuit is inside the refrigerator, find the damaged area and insulate or replace the wire.
• ⚡ In difficult cases (for example, a short circuit in the fan motor winding), contact a specialist.

⚠️ Attention: if you are not sure your skills in working with electricity do not disassemble the refrigerator yourself —the risk of electric shock or worsening breakdown is too high. It’s better to call a specialist.

5. Problems with the thermostat or control board

In modern refrigerators, a mechanical thermostat is responsible for starting the compressor. If they fail, false switching commands may occur, which leads to network overload. electronic control board or mechanical thermostat. If they fail, false turn-on commands may occur, resulting in network congestion.

Symptoms of malfunction:

• 📉 The refrigerator turns on and immediately turns off (sometimes with the plugs knocked out).
• 🔄 The compressor works continuously without turning off.
• 💡 Errors appear on the display (for example, E1, F2 models LG or Samsung).

How to diagnose:

• 🔧 For a mechanical thermostat: turn the knob to minimum cooling. If the refrigerator stops knocking out plugs, the thermostat is faulty.
• 🖥️ For an electronic board: inspect it for burnt elements (blackened resistors, swollen capacitors).

Solution:

• 🛠️ Replace the thermostat (cost - from 500 rubles).
• 🔧 Reflash or replace the control board (at the service center).

6. Malfunction of the fan or No Frost system

In refrigerators with a system No Frost the fan is responsible for air circulation. If its motor is jammed or the winding is burned out, this can cause:

• 🔌 Network overload at startup.
• 🔥 Short circuit (if the insulation of the wires has melted).

Symptoms:

• 🌀 The refrigerator does not freeze, but the compressor works.
• 🔊 A hum or grinding noise coming from the back (behind the ice maker).
• 💨 There is no air flow in the freezer.

How to check:

1. Unplug the refrigerator.
2. Remove the back panel of the freezer (in models No Frost).
3. Try to turn the fan blades manually. If they do not rotate, the motor is jammed.
4. Test the fan winding with a multimeter (resistance should be 200–500 Ohms).

Solution:

• 🛠️ Replace the fan (cost - from 800 rubles).
• 🔧 Make sure that there is no ice on the blades - sometimes its accumulation blocks rotation.

7. Problems with the network voltage: surges or low voltage

If your network frequently occurs voltage surges (below 180 V or above 240 V), this can lead to:

• 🔌 False operation of the machine.
• 🔥 Overheating of the compressor and relay.
• 💥 Breakdown of electronic components.

How to check:

• 📊 Use multimeter or socket tester, to measure the voltage in the network. The norm is 220–230 V.
• 🔌 If the voltage fluctuates, connect the refrigerator through stabilizer.

Solution:

• ⚡ Install a voltage stabilizer (with a power of at least 1 kW).
• 🔌 Connect the refrigerator to a separate line with an RCD (residual current device).

What to do if the refrigerator knocks out the plugs: step-by-step instructions

If you are not sure of the reason, follow this algorithm:

1. Step 1. Disconnect the refrigerator from the network. Do not turn it on. until the end of the diagnosis!
2. Step 2. Check the outlet and machine:
   • Connect another device (for example, a lamp) to this outlet. If the plugs come out, the problem is in the wiring or the machine.
   • Inspect the machine: if it gets hot or smells like burning, replace it.
3. Step 3. Inspect the power cord of the refrigerator:
   • Pull the cord - if the plug is loose, replace it.
   • Test the cord short with a multimeter short circuit.
4. Step 4. Check the compressor and relay:
   • Listen: if you hear a knock or buzz when you turn it on, and then the plugs come out, the problem is in the compressor.
   • Remove the relay cover and inspect the contacts.
5. Step 5. Diagnose the board and thermostat:
   • If the refrigerator turns on and turns off immediately, check the thermostat.
   • Inspect the board for burnt elements.

Step 6. Contact a technician if:

• You have found burnt parts, but are not sure about replacing them.
• The problem is in the compressor or control board.

⚠️ Attention: if the refrigerator explodes (a pop is heard) when turned on and knocks out the plugs, do not turn it on again is a sign breakdown. capacitor or a short circuit in the compressor winding. Immediately disconnect the device from the network and call a technician!

FAQ: Frequently asked questions about the refrigerator knocking out the plugs

Is it possible to turn on the refrigerator after the plugs have been knocked out?

If the plugs have been knocked out once, you can try to turn on the refrigerator again, but only after checking the socket and machine. knocking out is repeated - do not turn it on the device until the cause is eliminated. It is especially dangerous to turn it on repeatedly when the compressor is jammed or short circuited - this can lead to a fire.

Why does the new refrigerator knock out plugs, but the old one worked? normal?

Modern refrigerators (especially those with No Frost and inverter compressors) have a higher starting current. Possible reasons:

• The old circuit breaker in the panel is not designed for the new load (replace with 16 A).
• V The socket has weak contacts (need to be cleaned or replaced).
• There is low voltage in the network (install a stabilizer).

Also check if other powerful devices are connected to the same socket.

The refrigerator knocks out plugs only at night.

Probable reasons:

• At night, the voltage in the network increases (there are few consumers), and the refrigerator begins to operate unstably.
• The thermostat is activated for cooling due to an increase in the temperature in the room (for example, if the air conditioner works during the day and turns off at night).
• Problems with starting relay, which “sticks” during prolonged inactivity.

Solution: install a voltage stabilizer and check the relay.

How much does it cost to repair if the refrigerator knocks out plugs?

The cost depends on the reason:

Breakage	Repair cost (RUB)
Replacement of power cord	300–800
Replacement of start relay	800–1 500
Repair/replacement of compressor	3 000–8 000
Replacement control board	2 000–5 000
Replacing the thermostat	500–1 200

Prices do not include spare parts. In service centers, diagnostics can cost separately (from 500 rubles).

Can a refrigerator knock out plugs due to dirt or ice?

Yes, but indirectly:

• If the fan No Frost is blocked by ice, the motor overheats and can cause an overload.
• Dirt on the condenser (rear grill) impairs heat transfer, causing the compressor to run longer and consume more current.
• Dust on the control board can cause a short circuit.

Solution: defrost the refrigerator, clean the condenser and fan, wipe the board with alcohol.