How to replace the power cable in your calorifer

Introduction

Replace the power cable when your heater stops working, smells burnt, or shows melted insulation around the plug. A cracked or broken lead is a fire and shock hazard, and swapping it for a sound three-core cable restores safe, reliable operation without buying a new unit.

What you need

1. Step 1 Disconnect power and gather tools
  
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  Unplug the calorifer from the mains before starting any work.
  
  Set the heater on a stable, well-lit surface and keep small screws in a safe place.
  
  Have a screwdriver, pliers, wire stripper, utility knife, multimeter and closed wire connectors ready.
  
  Menjavi sem potreboval en izvijač, klešče, klešče za blankiranje, olfa nož, multimeter in zaprte spojke.
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2. Step 2 Remove the outer housing
  
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  Undo the four flat-head screws on the casing with a flat screwdriver.
  
  Tale so štirije na vsaki strani.
  
  Slide the housing away to expose the motor, thermostat, switch and wiring.
  
  Pull the front piece free only after the interior bracket is out so the shell can separate completely.
  
  To je pomembno, da se je to vzel ven, ker drugače se v hiši ja ne da vzeti na razen.
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3. Step 3 Document wiring and disconnect old cable
  
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  Use a phone to photograph every wire before loosening anything.
  
  Svetujem telefon, da si žice, kable poslikate prednji se gre karkoli demontirati.
  
  Observe that the black conductor feeds the motor, the white the indicator lamp and the yellow the thermostat.
  
  Ta črna gre na motor, bela na lučko, romena na termostat.
  
  Unscrew the strain-relief clamp that grips the cable inside the heater.
  
  Distančnik, ki kabel dol drži in preprečuje, da bi se kabel lahko cuknul.
  
  Loosen the terminals or connectors and pull the damaged cable completely out of the appliance.
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4. Step 4 Verify the fault with a multimeter
  
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  Set the multimeter to continuity mode so it beeps when a circuit is complete.
  
  Ga nastavimo na piskača.
  
  Probe each conductor from plug pin to wire end; a tone means good continuity.
  
  Silence on one core confirms the cable is broken and must be replaced.
  
  Ta pa ni, torej kabel je prekinjen.
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5. Step 5 Reuse the original strain relief
  
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  Slide the plastic strain-relief sleeve off the old lead and keep it for the new cable.
  
  Tole se tudi splača vzeti dol iz starega kabla.
  
  Push the sleeve onto the replacement cable in the same orientation before any wiring work.
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6. Step 6 Strip the replacement cable
  
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  Score the outer jacket lightly with a utility knife while keeping fingers clear of the blade.
  
  Vzolj pa nožem z občutkom, tukaj paziti na prste.
  
  Peel off the loosened jacket to reveal the three inner conductors without nicking their insulation.
  
  Da ne uničimo izolacije na žicah.
  
  If you need more bare length, make several shallow cuts along the cable rather than one deep slice.
  
  Boljš, da se večkrat potegne, kot pa da se v prvo preveč zareže.
  
  Strip a short section of insulation from each conductor using wire strippers for an even finish.
  
  Če pa imamo klešče za zblankiranje, pa še toliko boljše.
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7. Step 7 Prepare closed wire connectors
  
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  Break off the required number of closed wire connectors from the strip.
  
  Takole se posamezno vzamejo v stran.
  
  Cap the earth conductor with a connector if the appliance design does not use grounding.
  
  Nič ni s tem na robe, če ugotovite, da ozemljitve ne potrebujete.
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8. Step 8 Join appliance wiring to the new cable
  
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  Match conductors: the old black phase becomes the new brown, and the blue neutral stays blue.
  
  Ta je star kabel in je faza obarvana črno, ta je novejši in je faza rjava.
  
  Twist groups of wires together tightly with pliers before inserting them into the connector.
  
  Pomembno je, da se žice prvo mal zvite skupaj.
  
  Hold the wires firmly inside the connector while tightening the screw so nothing backs out.
  
  Se to drži medtem, ko se zadevca zategne.
  
  Perform a firm pull test; redo any joint that is not rock solid.
  
  To se še takle proba, to more držati, dokler vse skupaj ni fiksirano.
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9. Step 9 Route cable and secure strain relief
  
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  Lay the new cable into its original path and seat the strain-relief sleeve in its slot.
  
  Tighten the strain-relief screws so the cable cannot be pulled out but is not crushed.
  
  Refit any parts that pop out during handling and stay patient if you need to reopen the casing.
  
  To se pa zgodi in to je čist nekaj normalnega.
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10. Step 10 Reassemble the heater
  
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  Reinstall the casing and tighten the screws gently to avoid cracking aged plastic.
  
  Pri teh starejših plastikah vsem z občutkom zategnemo.
  
  Return the thermostat knob and power selector switch to their original positions.
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11. Step 11 Test the repaired calorifer
  
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  Plug the heater in and cycle through cold and warm settings to confirm the fan and elements operate.
  
  Verify continuous operation without flicker or smell, showing the cable replacement is successful.
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Conclusion

Your heater now has a safe, serviceable power cable. The closed connectors and securely clamped strain relief stop future arcing and strain damage, extending the life of the appliance and keeping you warm without worry.

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