Maytag MZF34X16DW01 Upright Freezer Service Pointers

[EthanRanft]

Manufacturer: Maytag

Type of Appliance: Upright Freezer

Model Number: MZF34X16DW01

Have you validated the model number at an online parts site like Repair Clinic? (yes or no): Yes

Have you watched the video on how to search for manuals and have you searched the Downloads section prior to posting this request? (yes or no): Yes

Looking for any applicable service pointers for this freezer, specifically dealing with evaporator icing up

[Captain Dunsel]

@EthanRanft I see no service pointers on this!

[dufoedavid]

@EthanRanftDealing with one of these now, what was your solution? Everything tests and checks out on the unit i'm working on but the evap keeps icing up.

[Daniel Rufledt]

Did you get the defrost issue fixed???  Tks in advance.  Dan

[smee123]

Any updates?

[Joe B, Stoughton Appliance Repair]

Bump. Same reason. Inexplicable no-defrost. Replaced evap thermister for callback and minor variance 12 months ago. Another callback.  

[adamsappl12]

Have one not defrosting. Put new control in as it wouldn't even turn the freezer off but still not defrosting. Anyone figure theres out?

 

[Tquery1]

I have one the compressor failed with, and I have it in my shop, I replaced a failed compressor that was mechanically failed  and I noticed through a data recording session that the defrost  gained all the way to 40° air temperature and dwelled for about 30 minutes I was checking it empty ….but at the same time that seemed excessive …I checked the thermistor for the evaporator and it was about 4° off in  ice water…. on  the thermistor chart …I’m thinking they have problems with the thermistors they’re not letting us know about / before it went to defrost everything was great …but then it heated up with an amp draw at 30 min at 1.5 amps… it went all the way up to 40 Fahrenheit, which I didn’t feel was right…. you’re gonna get freezer burn !!! same family ….the model I am working on is MZF34X26DW maytag freezer wondering about the engineering here????

[Tquery1]

Since I have plenty of time on this freezer in the shop, I’m going to go ahead and order  thermistor .. since it’s not right on the chart/ put it in a ice water against what I have. The algorithm in the control seems to be OK during running. I’m wondering about the algorithm for defrost at 40° air temp…I would’ve thought it would’ve come out quicker … it it dwelled for the complete 30 minutes  it didn’t piss for the complete 30 minutes though ! Quit pissing after about 15 minutes  ..I’m not sure that the control sees the temperature and then puts timing in  it to come out of defrost… instead of coming out just after it, sees the temperature …I think after watching this model that’s how they have that… thinking into that.. it doesn’t react to the thermistor immediately after the thermistor reaches the threshold, they time it to come off and then on  and vice versa…in the algorithm 

[Tquery1]

This is been a big learning curve on this freezer for me and I’m taking my time learning about technology after all I’ve been only doing this 37 years and feel like I’m a beginner again on certain products