The PDU is typically installed under a seat base, bed base, or inside a lower cupboard.

When your motorhome is connected to an external hook-up, mains electricity enters the PDU first.

Inside the unit are circuit breakers, similar to those in a domestic fuse box. Each breaker protects a different circuit, such as:

• 230-volt socket outlets
• Battery charger
• Water heater or space heater

If a breaker trips, it can be reset by pushing it upwards to the on position. If it trips again, there may be a fault that requires professional attention.

The PDU also contains blade fuses protecting the low-voltage circuits powered by the leisure battery.

These circuits typically include:

• Interior lighting
• Water pump
• 12v appliances

If a particular system stops working — for example, the lights or water pump — check the corresponding fuse. Remove the fuse and inspect the metal strip inside. If it is broken, replace the fuse with one of the same rating only.

Your motorhome may include a dedicated fuse for the toilet flush.

Importantly, this fuse is often not located in the main PDU so if you do not find the toilet flush fuse, there are other places you can check in the motorhome.

On most Bailey motorhomes fitted with cassette toilets, the fuse is located near the toilet, usually inside the external cassette door.

Check this fuse if:

• The electric flush does not operate
• The flush pump makes no sound

Never replace a fuse with one of a higher rating, as this can cause wiring damage or fire risk.

If a fuse repeatedly blows, there may be a fault in the appliance or wiring that a qualified technician should investigate.

Always disconnect mains power before working on electrical systems.

Jump to:

• Beginners Guide to Motorhoming – Homepage
• How to load your motorhome
• How to use your motorhome cab: Ford
• How to use your motorhome cab: Peugeot
• Arriving on site: How to level your motorhome
• Arriving on site: Electrical system
• Arriving on site: Gas system
• Arriving on site: Water system
• Arriving on site: How to set up your Truma or Alde heating system
• Arriving on site: Toilet cassette
• Arriving on site: Fridge
• Arriving on site: Hob, oven and grill
• Arriving on site: TV aerial
• Arriving on site: How to set up your wind out awning
• Power Distribution Unit (PDU) and Toilet Fuse
• Glossary