Question about Hoshizaki Commercial Freezer KM-500MAH

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Evaporator is a block of ice. it didn't drop between cycles an has frozen over.

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Usually it's an ice thickness sensor that goes bad located on top of evaporator 1/2" away from it.
Hoshizaki ice machine repair orange county, ca

Posted on Feb 06, 2010

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Top half of upright freezer is warm


Hello Karen;



My name is Peter. I am a retired field service refrigeration technician.



The top half of your freezer is warm because your cooling (evaporator) coil is on the bottom.



With your unit there are generally two cooling problems:



1.) Frozen Drain - You freezer will go through a defrost cycle every 8-10 hours. When this occurs, everything shuts down with the exception of your lights. Your defrost heater turns on for about 20-30 minutes, defrost you cooling coil and them turns your unit back on.

Most common, is that you have a frozen drain. If you have a frozen drain, when your unit goes through the defrost cycle, if your drain is plugged then the condensate builds up on your cooling coil and restricts the air flow. Use a hair dryer and melt the ice.



2.) Freezer fan motor is bad - Your freezer fan motor may be bad. This is easily replaced.



Ok, Lets get it done. I have faith in you.

a.) Unplug your unit.

b.) With a screw driver remove the 6 screws holding the bottom cover. You control may be in the way.

c.) I know you can do this. Remove the back cover. Is you cooling coil blocked with Ice? Defrost with a hair dryer. Do not use metal tools, you may damage the cooling coil.



b.) After defrost, Is you cooling fan running. You can do this as well. There are only two contacts to remove and a ground wire. If it is not running purchase a new one.



I have faith in you Karen. Call me and I will walk you through this.

443-306-1362, Glen Burnie, Maryland, USA

Dec 29, 2014 | Freezers

2 Answers

Not freezing


Hello Jim;

My name is Peter. I am a retired field service refrigeration technician.

If you are getting cooling and not freezing your problem is not your overload relay or capacitor, otherwise you would get no cooling at all.

You have one of 4 potential problems.

1.) Frozen Drain - This is a common problem. Your unit goes through a defrost cycle every 8-10 hours, everything shuts down for about 20-30 minutes. This is when your defrost heater turns on and defrost your cooling (evaporator) coil. If your drain is frozen, a wall of ice builds up behind your lower back wall. This prevents the cooling fan from running and air flow through the cooling coils.

You need to remove the lower back cover to see what is going on. there are several screws holding it on. First remove the rubber seals on both sides. They just pull out.

If it is a block of ice, use a hair dryer to melt the ice and clear the drain. Do not try to chip away, you will damage the coils.

2.) If you observe the cooling coil fan not running and vibrating, then you need to replace the fan.

not-freezing-q5gyx04vmzg44gwribm3t5si-2-0.jpg Part Number: Substitution: 3-60336-001 Cost from Sears: $115.00. You can search the internet and get this part for about $80.00.

3.) Defrost Heater - You may have a bad defrost heater. Observe, is the glass tube black or is the wire inside broken?
not-freezing-q5gyx04vmzg44gwribm3t5si-2-2.jpg Part Number: Substitution: 3-80405-003 Cost: $40.00

4.) Refrigerant leak or obstruction - If you observe a block of ice in the upper right hand corner of your cooling coil, then you either have a leak or an obstruction. A repair of this nature with a service company is about $500.00.

5.) Bad Bi-Metl (Thermostat) - In the upper right corner is your cooling coil thermostat.

not-freezing-q5gyx04vmzg44gwribm3t5si-2-5.jpg Part Number: Substitution: 1-81801-001 Cost: $30.00

If you observe the flat back has popped open, then replace.

Sep 12, 2013 | Whirlpool EV181NZTQ Upright Freezer

1 Answer

Inside rear panel bulging


Unplug the unit and take out all the drawers and remove the back (behind the drawers) panel carefully. (This back panel has foamy thermal insulation behind it and this will be probably be enmeshed with ice - you may have to wait awhile for this ice to melt before you can remove the panel, even after you have unscrewed it.
When you have got the back panel off, you will see a large solid block of ice, probably halfway up the cooling coils, right down to the bottom of the exposed space. You have to melt all this ice (I used a hair dryer to blow warm air onto the ice (have towels and a bucket ready to mop up the melted water, otherwise it will run over the floor. When you have melted all this ice, you will see a drain hole at the bottom of the exposed space. This will have ice in it and it must be cleared.
Then replace the back panel and all should be OK.
The panel bulges because ice/water is accumulating behind the panel, water, when it freezes, expands, forcing the panel forwards.
I reckon it's a Hotpoint Design fault. What is supposed to happen is that during the heating cycle, melted ice drops down from the cooling coils and down the drain hole onto a plate over the compressor unit, where it evaporates. BUT, during the cooling cycle, a fan circulates cold air from the cooling coils, through the entire unit, which includes the chamber behind the panel that is below the coils. Thus this chamber gets cold (-18 deg.C) so that water dripping down during the heating cycle is frozen before it has a chance to fall down the drain hole.
I now defrost in this manner every six months or so. Sadly, very sadly, Hotpoint, like other white goods manufacturers (Baxi Potterton boilers for instance) do not reply to my enquiries.
Hope this helps.

Feb 19, 2013 | Hotpoint 6.92 cu. ft. / 196 liter Upright...

1 Answer

We have a hoshizaki ice machine 901mwh the ice cubs seems to be getting stuck in the evaporator area and pileing up on it self and freezing bake up


The main problem with Hoshizaki machines is if you are in a hard water area, if so do you have a good quality water filter, it may need changing. A quick way to check for calcium ot lime deposits in the machine is
1. Turn it off, run you clean hand around the area near the evaporator, are there any rough or flaky deposits there, if so you may need a chemical descale, contact a reputable fridge guy to do this for you.
2. The swinging arm motor may be faulty or possibly the ice sensor which controls the harvest cycle. If this is faulty sometimes the tray goes back up before the ice has slid off.
3. If the machine is situated in a cellar or other cool (less than 10 deg C / 50 deg f) this can sometimes affect the harvest cycle again to set this you need a tradesman.
4. Does the water flow properly over the lower part of the mould plate during a harvest cycle, the pipe can become blocked or dislodged.

Hope this is helpful

Apr 14, 2011 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Does it make sense that a frigidaire plhs67egsb3 refrigerator freezer could stop working simply from overloading? The compressor is running, the condenser coil was clean but the evaporator coil was frozen...


the defrost heater or thermostat circuitry is bad,you need to test both components,also the defrost timer control if the other parts test o.k..,the defrost tstat has to be below 32 degrees or it will test bad/open,when the evaporator coil gets iced up you cannot blow cold air through a solid block of ice,(NO air flow)means no cold air throughout the unit even with the evaporator fan running

Apr 12, 2011 | Frigidaire Freezer FFU1212D

1 Answer

I have a GE GTS 221C fridge/freezer. The fridge is working fine. All of a sudden, the freezer is not freezing. Just cold, but not enough to keep food frozen. The fan on the freezer is working.


remove the rear cover inside the freezer if it has a lot of frost on it,then the evaporator coil is frozen up and you cant blow cold air over or thru a solid block of ice,defrost it,then check the defrost heating element,defrost thermostat and timer or defrost circuitry for no power or defective components,you can use a hand held hair dryer to defrost it quicker

Jan 08, 2011 | GE Freezers

2 Answers

Hoshizaki KM-900MAH Ice Maker it sounds like it is making ice and is freezing it but its not dropping ice any solutions?


Do you hear the machine cycling like normal but just not dropping? Could be the hot gas solenoid. If you never hear it trying to drop that could be anything from a dirty condenser to dirty plates to bad ice thickness control. Run some ice machine cleaner through it and blow the condenser out.

Mar 20, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

COMPRESSOR WILL FREEZE A CYCLE OR 2 THEN STOP WORKING


a symptom of low refrigerrant is that the evaporator coil will develop a small very cold area but wont cool the entire surface .. that cold area can ice up and block air flow .. the result can be an overworked compressor with little or no cooling ... other things that can cause the same trouble
1. bad or blocked air flow on the external coils or condenser fan ..
2. a leak in the door seal will allow moisture that can cause icing

if there is icing then you can turn it off with the door open until the ice melts .. then start over ..

Jul 24, 2009 | Freezers

2 Answers

Ice Cubes won't drop out


The thickness probe should be approximatly 1/4 inch off of the evaporator.Sounds like you might have loose grids on the evaporator.turn the unit off and remove the curtain.use a flash light and inspect the grids.There should not be space in between the joints,if there is the ice will freeze behind the grids and not properly release when in harvest. Also gently pull at the grids,if they pull towards you or wiggle then they are separating. I have removed one of the grids and had the unit continue to run for sometime until the evaporator could be replaced.The plating being spotty causes release issues as well.Finally check the level of the machine,front to back and side to side.Not being level will also cause release problems

Feb 18, 2009 | Freezers

1 Answer

Msf-49nm evaportor pan and drain iced up


I deal with MasterBilt which is a private lable made by TurboAir.
I have several units but only one does this icing up thing. Look for a bad seal on the door gasket. These really ice up if that does not seal almost perfectly. Look for premature termination of the defrost cycle. Check that the heater is pulling amps. The wiring diagram at "turboairinc.com" is very poor but it shows 2 heaters for the refrigerator. They list a diagram for the freezer but it's not there. I know for sure that there is a heater for the evap but don't know about the drain. I've seen some have it and some don't. there tech support line has much to be desired but it's worth a shot. Also, the bottom hinge on the door fails fairly regularly. This allows the door to drop just enought to disengage the switch at the top of the door and stop the evap fan from running, thus causing a freeze up.
Good Luck . You got your hands full with this one.

Dec 11, 2008 | Turbo Air 49 cu. ft. / 1388 liter...

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