Okay, if you don’t know quite what the heck the title means, but you have a Daikin, or rather — two internal Daikin units, and one keeps flashing that green light at you and not working, while the other flashes solid green and works — then this is probably for you. I just got one installed, and they’re nice, though I do miss my old GE unit that kicked in like a mofo. Unfortunately, it’s just not as energy-efficient or useful as a Daikin. But that GE unit did roar.
Okay, here’s the issue — what’s probably going on is you’re trying to set both of the units to different modes. It’s as simple as that. You have one unit outside, despite having two units inside. You can use the inside units to adjust temperature, but if you try to split modes on the two internal units, one will shut down and one will work (the working one will have a solid green light; the flashing green light will be on the one that doesn’t work). If you check for an error code, you won’t find one other than “00”, which means either the unit is functioning or there’s a sensor/communication error bigtime which is kinda scary.
Well, don’t worry, there’s sort of a communication error, but I think it’s telling you the unit is basically functioning. You just need to set both internal units to the same mode. Start with the one with the solid green light. Check what mode it’s in. Set the other internal unit to that mode (heat, AC, cool, whatever). Now go change the other unit to the mode that the working unit is in. If the other one is on heat, put this one on heat. You should be able to alter the temperature.
Now, the flashing green light should disappear and the non-working unit should work. I’m not quite sure how the system decides which internal unit is running the show yet, though. It appears to be the one you last got a steady green light on. Or that currently has a steady green light. In other words, one of your units should have a steady green light. If they both have flashing green lights, pull down the front of the remote, hold down “Cancel” for six seconds; “00” will pop up; cycle through the error codes using the middle select button until you hear a long beep. There’s your error code.
However, if you just got the system installed, and it was working, it’s much more likely the fact that you have them set to different modes. You can’t set one to air conditioning and one to heat. You can’t do it. Which kinda pisses me off because sometimes I like to turn both AC and heat on and let them battle it out for temperance. You can set both to automatic, or both to heat, but…if you have one outside HVAC unit, you’re going to be stuck in one mode, I’m pretty sure. Temperature can differ, though. And I believe you can just put the fan mode on, though I’m not sure.