Join Date: May 2005
Location: Bridport, Dorset
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This was posted in answer to a similar question by jhelm a few months ago.
Before attempting this isolate both 12 & 240v electric supplies and turn gas off.
Might I suggest that you completely dismantle the gas burner assembly and clear out the debris (Rust) from the burner itself. I will guarantee that you will remove about a tea spoonful of rust. If as you say that you had difficulty in removing the retaining nut, pre soak it with a good squirt of WD40 and leave it for a while. The little jet shown will need a good clean but no attempt should be made to enlarge the hole although it can be cleaned with a Primus Pricker or an extremely fine sewing needle. If you attempt this take care not to lose or damage the jet. Before assembling clean out the flu, most of the debris comes from this.
I believe on an absorption fridge it is impossible to top up the refrigerant.
I used to do this twice a year on my 1993 Hymer that I had for nearly twenty years and never once did it let me down. If you have any questions please ask.
Posted by Eurojohn.
Firstly with the outer vent cover off and the burner shield removed have a helper turn the control from off to gas operation, if the igniter sparks but no flame is produced you can safely assume no gas is being delivered to the burner, the most common reason is dirt, dust, rust covering the top of burner, it is very very unlikely to be a blocked jet as there is an efficient filter / strainer upstream of jet. It is also possible that there is a fault / failure of the gas control device, however that is quite rare, so won't go into detail here.
If you consider yourself proficient enough to carry out DIY repairs you will need a pozi drive No.2 screwdriver, an 11mm open end spanner and a 13mm open end spanner.
Before you start work turn fridge control to off and isolate the gas supply to fridge.
If fitted remove the push on earth connector on burner head (later models don't have separate earth lead) then unplug the igniter and flame failure leads from the control module (they simply push in and pull out) make a note of which one goes where.
Support the square aluminium jet / burner housing with the 13mm spanner and undo the 11mm nut that retains the gas feed pipe into the burner, undo the single No.2 pozi screw that holds the burner assembly to the exhaust tube, allow the burner housing to drop away from exhaust tube and carefully remove the burner assembly, be aware that the jet is simply dropped into the housing and held in place with the feed tube, so is free to fall out and get lost on floor, it is a small pressed dished washer like device that has a tiny hole in the centre. When you have the assembly safely on a clean work surface ensure that the ring of holes at the top of the burner are clear of obstruction and clean if available blow out with compressed air, ensure the jet is actually clear but under no circumstance poke anything in it, the size of the hole is critical to the correct operation of the fridge, so long as the hole is clear and there is no damage to it you will not need a new jet they do not wear. It is possible the flue exhaust will also need cleaning, it's not unknown for them to become blocked by spiders etc. a long bottle type brush is best here , don't try to pull rag through it will get jammed, also if cleaning the flue you will need to access the top of pipe and remove the spiral baffle within the flue before you attempt to clean it, it is simply dropped back in place after cleaning.
Re-assembly is a reversal of dismantling, ensure the jet is correctly placed within the burner (dished end towards burner), at this stage do not replace the burner shield, turn on the gas supply and get your helper to turn control to gas operation, you may need to do this a few times to bleed air out of supply pipe, the burner should now light and stay alight, using a leak detector fluid ensure any joint you disturbed is sound and not leaking. Turn off fridge control and the taking care as the area will now be hot replace the shield and outer covers.
If the burner fires up but fails to stay alight the flame failure device is faulty and you will need to purchase a new burner assembly as they do not supply the flame failure probe separately.
As I mentioned earlier only attempt this if you feel confident to do so otherwise get a qualified and certified person to carry out the repairs for you.
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Last edited by Drew; 16-09-2019 at 12:09.