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Spent the weekend on the boat. As its unoccupied the rest of the week it was a little chilly so heating was bunged on. We have recently bought this boat (second hand), so do not have much experience of all the fixtures and fittings and we keep getting little surprises. The heating ran OK Friday Evening. Saturday evening, the heating was back running (hard to miss, the Hurricane is somewhat loud) but after about 30 mins the radiators were just luke warm and similar on the calorifier. No error codes on the control panel. Continuous running of the Hurricane. Still not much output. Flame bright and yellow when looking through the inspection window, though not uniform and looking "spluttery". It was dark at the time or I would have spotted the next bit earlier.... Outside with a torch and look at the exhaust. Considerable smoke and signs of unburnt fuel in the exhaust. D'Oh! So shut it down, and time to investigate. Not had this apart before. Find the 1000 hour service info on the web which was the best information I could find at the time.... The Hurricane is a fairly standard design air blown siphon nozzle diesel burner, so the nozzle seemed a likely problem. Compressor and fan all running, Air inlet hose not blocked, exhaust appeared clear of any blockage. Time to dismantle...... Nozzle out (Delavan 30609-2). Stripped nozzle and found small piece of what appeared to be brown rubber, about 2mm across, but nothing else, all very clean. Air hose to the nozzle checked and clear, compressor inlet filter looked brand new, fuel filter in the nozzle holder appeared clean. The hours counter on the heater has just got to 80, so very little use since new (2006). Rebuild it all and try again, though not very hopeful. Same result. Sunday morning. Still think its a nozzle/spray related issue, so take out the compressor. Standard diaphragm affair so take off the head. Fail to find any information on the web (its a "Thomas" compressor from the US). Obviously has an inlet valve, visible as a brown rubber mushroom head, but no sign of the discharge valve apart from some rubber sticking to the edges of the hole where it should be. The compressor head is a plastic affair and appears to be of two parts glued or molded together, with the head of the discharge valve inaccessible inside, so no chance of fixing it easily. Luckily the boat is at Calcutts who are Hurricane dealers. With no great expectation of success I head to the marina shop, discuss the issue and:- Yes these compressors are known to fail, especially early ones (like ours) No they did not have a direct spare in stock (Hurricane no longer supply them due to reliability issues) Yes there is a replacement, may have one in stock but £300++ needing various parts to make it fit. By now its lunchtime and I agree to come back after lunch when they will have had time to find the various parts. When I get back I find better news, they have a later version compressor head with stainless steel reed valves for a much better price of £40. Brilliant service from Calcutts! Back to the boat, rebuild compressor, fire it up and Yippee it all works ok. Thanks Calcutts, saved the day and my wallet. Chris