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Xringer · 12-12-10, 11:54 AM

Early this morning it started raining a little, the outside temperature came up about 5F in 2 hours.
Suddenly, I heard the indoor unit get very loud. (About 6:15 AM I think).
The power was at 2.65kW! I backed down the setting (from 21 to 19C).
It went to low power. I found my VOM downstairs and checked the line voltage.
It was normal. About 125vac (250 to the Sanyo).

I had left the indoor fan speed in Auto mode. So I would be alerted to any odd operation by louder fan noise.

Was this weird jump in power caused by damp weather and a quick outdoor temperature change?
Or did the power line voltage jump up for a minute and drop back to normal?
I'll be glad to get my TED, so I can log the line voltage history.

One other possible cause, could have been icing. If the Sanyo had gone into
defrost mode for a while, the room temperature could have been 2C low.?.
When it returned to normal heating mode, the thermostat called for 2C above room temp..
And that would definitely cause a power use surge..
But, when I ran out to inspect the coils, no traces of ice could be seen.
So, this one is a toss up.

Since the out-door unit is new (but made at during the same month as the old one),
I'm going to assume the indoor unit is very likely to have a fault or defect.

So, here's the plan. I'll get the TED in about a week, and start watching
the AC line voltage. After a week of data, I should be able to rule out
NStar.

My next task will be to pull the covers off the indoor unit, pull out the
control PCB, inspect the board and all the cable connections and the
thermistor for any visible problems.
I hope to find a connector half plugged-in..

But even if I don't, sometimes,
just removing a connector and replacing it, cleans up the problem..

I'm going to use the training info found here:

Training zone..
SANYO :: HVAC :: On-Demand Videos
Target for today:
Dismantling the "K" Wall Hung Unit

PS:
After a quick manual power-down-restart, the Sanyo restarted normally and is heating the house normally.
12:53PM: Kept turning it up to 23C (73.4), it's using 480w and it feels like Texas!

12-12-10, 11:54 AM	#234
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Dang! Almost had a over-load. Again! Early this morning it started raining a little, the outside temperature came up about 5F in 2 hours. Suddenly, I heard the indoor unit get very loud. (About 6:15 AM I think). The power was at 2.65kW! I backed down the setting (from 21 to 19C). It went to low power. I found my VOM downstairs and checked the line voltage. It was normal. About 125vac (250 to the Sanyo). I had left the indoor fan speed in Auto mode. So I would be alerted to any odd operation by louder fan noise. Was this weird jump in power caused by damp weather and a quick outdoor temperature change? Or did the power line voltage jump up for a minute and drop back to normal? *I'll be glad to get my TED, so I can log the line voltage history.* One other possible cause, could have been icing. If the Sanyo had gone into defrost mode for a while, the room temperature could have been 2C low.?. When it returned to normal heating mode, the thermostat called for 2C above room temp.. And that would definitely cause a power use surge.. But, when I ran out to inspect the coils, no traces of ice could be seen. So, this one is a toss up. Since the out-door unit is new (but made at during the same month as the old one), I'm going to assume the indoor unit is very likely to have a fault or defect. So, here's the plan. I'll get the TED in about a week, and start watching the AC line voltage. After a week of data, I should be able to rule out NStar. My next task will be to pull the covers off the indoor unit, pull out the control PCB, inspect the board and all the cable connections and the thermistor for any visible problems. I hope to find a connector half plugged-in.. But even if I don't, sometimes, just removing a connector and replacing it, cleans up the problem.. I'm going to use the training info found here: Training zone.. SANYO :: HVAC :: On-Demand Videos Target for today: Dismantling the "K" Wall Hung Unit PS: After a quick manual power-down-restart, the Sanyo restarted normally and is heating the house normally. 12:53PM: Kept turning it up to 23C (73.4), it's using 480w and it feels like Texas!