William Chops Westfield wrote:
> On Dec 1, 2005, at 8:09 AM, Neil Cherry wrote:
> 
>> And one day I will gather up all the debugging tips I can find and
>> put them in one online page.
>>
> 
> I have a wall switch in an outlying building.  After being pleasanyly
> surprised that it worked at all, it seems to have falling into a mode
> where the X10 controllers have trouble turning it on, but can reliably
> turn it OFF.  Got any suggestions or explanations?
> 
> BillW


http://www.geocities.com/ido_bartana/modifying_wall_switch.htm#Fixing%203%20way%20master%20switches%20that%20doesn't%20respond%20to%20remote%20switch

quote
Sometimes the problem has an even weirder manifestation: the slave 
switch can turn the light OFF but not ON. This is related to another 
parameter: the X10 transmission protocol. Turning ON requires more '1' 
bits than OFF. '1' bits are higher voltage, which as discussed, are 
attenuated. OFF is the absence of voltage, which is there by default. 
Thus OFF works but ON doesn't.
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