Troubleshooting

What you see

You press the switch; nothing turns on.

Common cause

The receiver often lost pairing, or the remote battery is too weak to register.

Try in order (tick as you go)

• 1 Open the manual and put the receiver in learn/pair mode — watch the LED pattern.
• 2 Within 10 seconds, press the wall switch or remote once; listen for beep or success blink.
• 3 If not, exit learn mode, power-cycle the receiver, try again with fresh remote batteries.

What you see

You press the remote or wall switch; the relay or load does nothing.

Common cause

No power to the receiver, dead remote batteries, lost pairing after a reset, or you are out of range.

Try in order (tick as you go)

• 1 Confirm receiver power and wiring (AC 85–250 V, DC 5–48 V, etc. — see your manual). Indicator should flash or stay on when powered.
• 2 Replace remote batteries (CR2032, CR2016, 12 V A27/AAA — check the label). Remote LED should be bright when you press a button.
• 3 Put the receiver in learn/pair mode and press the remote or switch once within 10 seconds. If unsure, clear codes (often 8 presses on the learn button) and pair again.
• 4 Move closer and remove metal cabinets or thick walls between remote and receiver.

What you see

Control is unreliable, or you must stand much nearer than before.

Common cause

Weak batteries, bent or hidden antenna, RF interference, or obstacles (walls, metal, other 433 MHz devices).

Try in order (tick as you go)

• 1 Replace transmitter or remote batteries first.
• 2 Extend or straighten the receiver antenna; do not mount the receiver inside a metal box.
• 3 Keep away from strong RF sources and other 433 MHz remotes; try a different location.
• 4 Re-pair one known-good remote after clearing all codes (learn button × 8 on many models).

What you see

Load turns off when you release the button, toggles unexpectedly, or runs when nobody pressed anything.

Common cause

Receiver programmed in the wrong mode (momentary vs toggle vs latched), interference, or stray 433 MHz signals.

Try in order (tick as you go)

• 1 If the load drops as soon as you release the button, you may be in momentary mode — reprogram latched/toggle per the manual (often 3 or 8 presses on the learn button).
• 2 Clear all remotes (learn button × 8 on many receivers), then pair only the remotes you use.
• 3 Move the receiver away from other 433 MHz gear; re-pair in the correct operating mode.

What you see

You hear the relay click; the lamp, motor, or pump still does not run.

Common cause

Output wired to the wrong terminals (NO / COM / NC), load needs its own supply, or wiring is loose.

Try in order (tick as you go)

• 1 Compare NO, COM, and NC wiring to the diagram in your manual — many loads need power through COM and NO (or NC for normally closed).
• 2 Tighten all screw terminals; confirm the appliance works when powered directly (bypass the receiver).
• 3 On DC kits rated for 5 V input, try 5.5–6 V if the relay clicks but the load is weak — some units need slightly higher voltage.

What you see

No indicator on the receiver, or the remote LED barely glows when pressed.

Common cause

Tripped breaker, loose L/N wiring, wrong voltage, or exhausted remote batteries.

Try in order (tick as you go)

• 1 Check breaker, fuse, and input voltage are within the range on the label (e.g. AC 85–250 V, DC 12 V).
• 2 Reseat line and load wires; the receiver LED should light when powered.
• 3 Replace remote batteries; during programming, press the learn button for the duration shown in the manual until the LED flashes.

What you see

Receiver feels hot, stops switching, or kinetic / relay kits no longer pass power.

Common cause

Connected load exceeds the rated amps (often 2 A, 10 A, or 30 A depending on model), short circuit, or blown internal fuse.

Try in order (tick as you go)

• 1 Disconnect the load and check the rating on the receiver label — reduce load or use a contactor for heavy appliances.
• 2 On kinetic kits with a 10 A fuse, power off, open the receiver, and replace the fuse with the same rating if blown.
• 3 After fixing wiring, power-cycle the receiver and re-pair if it was reset.

What you see

Motor spins backward, keeps running after you release the button, or ignores the remote.

Common cause

Reversed motor leads, wrong operating mode programmed, or weak transmitter batteries.

Try in order (tick as you go)

• 1 Verify motor power wiring matches the manual diagram; use the direction-change procedure if provided (e.g. learn button × 7).
• 2 Re-program the desired momentary, toggle, or latched mode; test with another remote if one button may be stuck.
• 3 Replace transmitter batteries and re-pair.

What you see

The app shows offline, then online again, by itself.

Common cause

Thick walls, metal cabinets, bad hub spot, or the Wi‑Fi router changing channels and bothering Zigbee.

Try in order (tick as you go)

• 1 Move the hub or a plug-in repeater closer to the weak device; fewer walls/metal in between.
• 2 Keep the hub away from microwaves and messy USB cables.
• 3 Unplug the gateway 3 minutes, plug back in; use any “repair / permit join” option in the app if you have it.

What you see

The app never finishes setup; the Wi‑Fi LED keeps flashing.

Common cause

Phone or router on 5 GHz only, weak signal, wrong password, or module needs a factory reset.

Try in order (tick as you go)

• 1 Use a 2.4 GHz Wi‑Fi network — 5 GHz is not supported on these modules.
• 2 Move the phone and module closer to the router during pairing; double-check the Wi‑Fi password.
• 3 Hold the pairing/reset button about 5 seconds until the LED flashes rapidly, then add the device again in eWelink / Smart Life / Tuya.

What you see

The device is in the app but toggles fail, or voice says the device is unavailable.

Common cause

Phone offline, module lost Wi‑Fi, outdated app, or voice account not linked to eWelink.

Try in order (tick as you go)

• 1 Confirm the module Wi‑Fi LED is solid (not blinking) and your phone has internet.
• 2 Update the eWelink / Smart Life app; pull to refresh the device list.
• 3 For Alexa or Google Home, re-link your eWelink account and run device discovery again; use the exact name shown in the app.

What you see

App control is fine; the wireless wall plate does nothing.

Common cause

Wall switch not paired to the module, out of RF range, or module lost pairing after reset.

Try in order (tick as you go)

• 1 Confirm the module is powered; hold its RF pair button 3–5 seconds until the LED indicates pairing, then press the wall switch once.
• 2 Stay within roughly 50 m open air (walls reduce range); replace the switch battery if applicable.
• 3 If the module was Wi‑Fi-reset, pair the wall switch again — Wi‑Fi and RF pairings are separate.

What you see

It used to reach farther; now you must stand near the door.

Common cause

Weak battery, bent receiver antenna, or new metal trim blocking the path.

Try in order (tick as you go)

• 1 Replace the remote battery (often CR2032 — check the label).
• 2 Straighten the receiver antenna; don’t hide it against a steel frame.
• 3 Re-learn one good remote to rule out a bad memory slot.