I believe the install manual recommendation is the maximum recommended temp to avoid potential damage to the plastic water valve and mixing chamber components. Being that majority of household water heaters in the U.S. nowadays are factory-set at 120°F, supplying 149°F to the machine is largely unrealistic.
If the incoming hot water is not hot enough, the control should trigger a (non-fatal) user fault, but will keep filling. A user fault involves the machine beeping and probably flashing the hot temp LED. (My IWL12 has an LCD alphanumeric display, which says "HELP, I'm not getting any hot water.") Unless the fault response has changed on recent software revisions, recirculation has nothing to do with a hot fill fault. A hot fill fault may not necessarily occur during the short / low-level Eco Active fill if the fill finishes before the control board time-out algorithm decides the incoming water flow isn't getting hot.
EcoSmart agitator machines do not run an agitated full-temp hot wash under normal operating conditions.
The initial fill for the Eco Active recirculation treatment period is at the selected temperature (there are five choices). Being as this is a very low-level fill (much less than the actual Low water level -- just enough to saturate the load and keep the pump primed during recirculation), the fill can end up being essentially cold if there's a long draw-distance on the household hot water supply.
The recirculation period should run about 5 mins.
Then the machine will fill rest of the way for an agitated wash period with controlled cold water to either an auto-sensed water level or a manually-selected water level.
Perm Press skips the Eco Active phase, goes directly to fill for the agitated wash ... but is limited to no higher than Warm temp selection.
There are two ways to get a FULL FILL HOT WASH:
1. *Program the Favorite button as follows (which is intended as a washer-cleaning cycle but can be used to wash clothes). Press/hold Favorite until it beeps and flashes. Select Perm Press. Select Hot temperature (programming this way on Favorite is the only time Hot can be selected with Perm Press). Press Favorite to save the programming. Now a hot wash can be run whenever desired by selecting the (now) programmed Favorite. (I assume) The water level can be manually set as desired for a given load after selecting Favorite. Perm Press runs normal agitation speed. If Delicate or Heavy Duty or Regular cycle is desired, let the machine fill with hot water to the desired level on Favorite, then shut off the power and restart on the alternate cycle, selecting a manual water level to match the already-filled level. The Eco Active phase will not run if the water level is already filled higher, the machine will go directly into agitation.
2. Fill the machine manually with hot water via Diagnostics, turn off the power and restart on the desired cycle with a manually-selected water level as per the already filled level.
* The programming sequence for the hot-fill washer-cleaning cycle is different on the earlier GWL10 model.
Edited by DADoESTX, 09 April 2013 - 10:46 PM.