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Central Heating Boilers

COMBI Boilers

In static holiday caravans and residential park homes, central heating combi boilers are commonly fitted. The main manufacturers are MORCO, which we are warranty agents for here at Stephen Ward Caravan & Boats, and Worcester Bosch, Ariston, and other manufacturers are also found. However, we can repair any caravan boiler.

The two types of boilers are normal combustion for older models and the new forced air combustion, which combines a condensing system. All rooms are room-sealed, taking air directly from outside and releasing fumes to the outside via the same flue system.

Boiler lighting sequences in all models are the same:

  • Demand either open a hot tap or turn the thermostat up.​
  • Fan comes on.
  • Air pressure switch recognises the fan is running.
  • Computer starts ignition sequence ie sparks.
  • Gas then flows to burner.
  • Gas is lit.
  • Computer sensors gas is lit via a sensor.
  • Boiler runs until demand is stopped.

Any breakdown in this sequence can stop your boiler from working, and multiple sensors within the boiler can also be at fault.

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Regular inspections of your appliances can help prevent breakdowns. 

Radiators are filled with a mixture of anti-freeze and inhibitor, which prevent rust and black sludge build up which can stop the boiler from heating properly. This inhibitor needs to be topped up every 5 years.

AS FROM APRIL 2014 all newly commissioned condensing room-sealed combi boilers must have a reading from a flue gas analyser.

Touring Caravan Boilers

There are two types, one is just a normal water heater, Truma, Propex, Whale and the older Carver. Then there are combi units Truma blown air heating and hot water and the Alde radiator heating and hot water.

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The modern caravan is normally powered by either gas or mains 230v electric. They require the hot water to be heated up for about twenty minutes before required. You can use both gas and electric heating sources to heat the water up quicker if required. Since the water is in a sealed tank I recommend not to leave the water heating switched on when not in use. The common problem is limescale build up from long periods of heating without a water chaange. This will then cause two issues, overheating which will cut out after one heating session or that the electric trips will acivate.

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On Truma water heaters and combi boilers, the heating elements can be repaired but will require the removal of the heater.

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On combi boilers, the combustion fan and sensors are a common issue, and these have to be removed and can be sent to a specialist for repair or replacement.

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