The pattern

You leave home in the morning. The fridge is humming. You come back in the evening. The fridge is silent, the food is warm, the fridge eventually clicks back on at some point in the night. You blame the fridge. You call the technician. The technician says the fridge is fine. It happens again next week.

This is one of the most common voltage problems in Kenyan homes and small businesses, and the cause has nothing to do with the fridge.

What is actually happening

Modern fridges and freezers have a protection circuit built in. When the supply voltage goes outside a safe band (usually 180 V to 250 V), the protection circuit opens the contactor and the compressor stops running. The protection circuit waits for the voltage to come back inside the safe band, then waits a few more minutes to make sure it is stable, then restarts the compressor.

This is the fridge being smart, not broken. Running a compressor on out-of-range voltage is what kills it. The fridge is doing exactly what it was designed to do.

The reason it is happening to you is that your supply genuinely does go out of range, often, especially in the late afternoon and early evening when local demand peaks and your nearest transformer sags. In Nairobi we see voltages drop into the 190 V range routinely on residential feeders. Upcountry it is much worse, with lows in the 170 V range during peak load.

So the protection circuit cuts in, the compressor stops, the food warms up, and four hours later the supply recovers and the fridge restarts. Repeat tomorrow.

What a service technician will (and will not) tell you

The technician you call to look at the fridge has two options. They can tell you the truth, which is that the supply is the problem and they cannot fix it from inside the fridge, in which case they have driven across town for nothing. Or they can replace the thermostat, charge you for the call-out, and tell you the problem is solved.

A few weeks later when the same thing happens, they replace something else. This pattern continues until you either give up or someone tells you about voltage protection.

The two devices that solve it

There are two off-the-shelf devices that solve this problem. They are different, they cost different amounts, and they suit different situations.

Option 1: AVS (Auto Voltage Switcher)

An AVS is a small box that sits between the wall socket and the fridge plug. It monitors the incoming voltage. When voltage goes outside its safe band (typically 210 V to 260 V), the AVS opens its internal switch and the fridge gets nothing. When voltage comes back inside the band, the AVS waits a few minutes and reconnects.

This is essentially the same protection the fridge has built in, but with a wider safe band, a longer reconnect delay, and a clear LED that tells you what is happening.

What an AVS solves: It protects the fridge from over-voltage and under-voltage events. What an AVS does not solve: Your fridge is still off during every event. The food still warms up. The AVS just makes sure the compressor does not get damaged when the supply is bad.

Cost: low. A single-outlet AVS for a fridge costs a small fraction of an AVR. They are sold in every electrical shop in Kenya as "fridge guards" or "volt guards."

Option 2: AVR (Automatic Voltage Regulator)

An AVR also sits between the supply and the fridge, but instead of cutting off when voltage goes out of range, it actively corrects the voltage. The fridge sees a steady 230 V regardless of whether Kenya Power is delivering 200 V or 250 V. The compressor runs continuously. The food stays cold.

What an AVR solves: Both the fridge protection and the underlying problem of the fridge actually being usable. Trade-off: Costs significantly more than an AVS, and most domestic-scale AVRs handle 1 to 3 kVA which covers a fridge but not the rest of the kitchen.

For a single fridge in a kiosk or a small shop, a 1 kVA single-phase AVR is a sensible buy. For a household where the fridge sits inside a panel-board with the rest of the kitchen, you are usually better off with a whole-house AVR sized for the full panel.

The full comparison between these two approaches is in AVR vs AVS: which one actually protects your equipment.

Which one is right for you?

The decision tree is short.

Fridge in a small kiosk, no other expensive equipment, food can tolerate occasional warming. Get an AVS. Costs little, protects the fridge, accepts that the fridge will be off during voltage events.

Fridge full of stock that cannot warm up (butchery, dairy outlet, restaurant chiller). Get an AVR sized for the fridge. The compressor keeps running through Kenya Power swings. Stock stays cold. Pays for itself the first time it prevents one batch of spoilage.

Whole house with multiple appliances on the same supply. Skip the per-appliance device. Get a whole-house AVR sized for the full incoming supply (typically 5 to 10 kVA single-phase for a Nairobi house). Everything in the house benefits, not just the fridge.

Commercial premises with cold storage, freezer rooms, ice machines. Definitely an AVR, sized for the whole cold chain plus headroom. Cold-storage stock losses dwarf the cost of the regulator.

A note on extension cables and the kitchen

A common mistake: people buy an AVS for the fridge, then plug the AVS into a multi-socket extension that also has the toaster, the microwave, and the kettle. The toaster fires up, draws 1500 W instantaneously, the AVS sees the load surge, and the protection trips. The fridge restarts but warms up every time someone makes toast.

If you go the AVS route, give the fridge its own outlet straight from the wall, with the AVS between the outlet and the fridge plug. Nothing else on that circuit.

If you go the AVR route, sit it before the kitchen panel and feed everything from it.

The bigger picture

Your fridge tripping is the most visible symptom of a broader supply problem. The same voltage swings are also shortening the life of your TV, your router, your LED bulbs, and every other piece of electronics in the building. The fridge is just the first to complain because it has a built-in voltage cut-out and the others do not.

If multiple devices in the building have failed unexpectedly in the last year, see why your equipment keeps failing. The cure is the same: get a steady supply.

For commercial premises, book a free site visit within Nairobi. For residential, the sizing tool gets you to a rough kVA figure for a whole-house unit.

Why Your Fridge Keeps Tripping (and What Actually Fixes It)