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Webasto Furnace
Blankenship wrote:
Can anybody help me troubleshoot my Webasto air furnace? It's a model HL32D. Normal operation as I heard it was: dosing pump running, then air fan, and we had heat. The last three or so start-ups was, as I heard it, and not knowing trouble was on the way: dosing pump running, air fan on, air fan off, dosing pump on, air fan on, then we had heat. Now when switched on, the only thing I hear is the air fan come on and run for a while, 90 seconds or so I believe, then shut down with no heat. Voltage at the heater terminal board before and during startup is 14.5 volts, with the needle barely moving during startup attempt. Any help greatly appreciated. Alan This is an older post I posted a while back, which I totally forgot about (sorry) after I found the problem, and for anybody interested here is what the problem was: a bad glow plug which went bad because of a bad fuel mat, I'm guessing went bad from "old age". The fuel mat is very fragile and cracks easily (you'll see why if you have one in hand), causing bad atomizing of the fuel and thus gunking the glow plug and eventually failure of the glow plug. The HL32D is a fairly simple unit to work on if you're mechanically inclined, and the shop manual made it possible, which I ordered from my local Webasto dealer. I ended up rebuilding the whole unit by myself with all new parts, including the heat exchanger, as the shop manual says to replace after 10 years, which mine was right at 10 years ($$, but not $$$!). I can now take the unit out of the boat in less than 10 minutes, which is usually not necessary for replaceable parts such as glow plug, flame detector. I now face new problems, which I believe are more than mechanical, but now electrical, as I have replaced glow plugs, flame detector, and had the unit running and putting out heat (with no smoke) but doesn't start up on it's own after reaching set point temp. I'm guessing now that I either have a bad t-stat, or 'black box' (or 'brain box', conrol box, what ever it's called). I'm almost totally lost reading schematics, so what I can figure out from all those line pictures is either the 'box' and/or the t-stat. The troubleshooting section kind of points towards these two. My next move is to pull the unit and check the fuel mat first before going to my local dealer and gatting him ($) involved. I'll be heading out of town for turkey day before attacking my problem and if anybody has a solution or ideas for me to check out first, I'd appprciate hearing from you on this forum (now bookmarked!) before I go ($) route. Happy Turkey Day updated e-mail address: |
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