Ice in the suction line - Heating & Cooling

Inside fan not moving enough air across the evaporator causing it to ice up, Thermostat sensor line not contacting the evap coils, low on freon. All these things will cause ice to build on the suction line.

hello, usually the suction line will form ice when there is low airflow due to a dirty filter or plugged eveaporator coil, also if the unit is clean then it is possible that the unit is low on refrigerant charge due to a leak. Inwould also check the thermostat on the unit to make sure it is fuctioning properly, I have seen may units where the thermostat cause the compressor to run continously and cause the suction line to freeze.

God day,
Some thoughts.
1. Are the evap fan motors running, and at full speed. That would give you abnormally low suction pressure.
2. Cap tube sized too small. or partial restriction in the dryer cap tube/dryer when brazing in the lines.
3. Low ambient. What's the temp the machine is running in.
4. Over sized compressor.
5. Moisture. God, 134A is touchy on that one.
6. Was original cap tube soldered to the suction line to create a heat exchanger. Needed on many apps. Definately would cause flash back on start up.
7. Superheat a little low, should be 12 to 15 degrees.

Bad thermostaic expansion valve inside.

Good day,
Unusual question.
Lots of reasons. You didn't say if it was cooling or cycling off and on.
1. Evaporator fan motor in freezer compartment not running. Doesn't allow the refrigerant to boil off and returns as a liquid.
2. Evaporator coil badly frosted allowing no air flow thru it. Same as #1
3. Runs constantly (days). no demand on system, and once again will not boil off before leaving evaporator.
4. Overcharged. Floods back excess charge.
5. Heat exchanger came apart. The capillary tube is soldered to the suction line to transfer heat from the cap tube to the suction line. Necessary on a refrigerator. Common problem.

Hope this helps
Thanks for using fixYa

1. First check if your door rubbers seals properly. if not, try and adjust yor doors so that they seal properly.what happens sometimes is that moisture leaks into your fridge.
2. It is also possible that your unit is overgased. you can buy yourself a valve that can be screwed onto the suction pipe line to your compressor. at the back of your fridge you will find a condenser unit that is directly connected to your compressor. that is called the discharge line and you will notice that the discharge line is thinner than the suction line to your compressor. get yourself a set of fridge gauges that you will connect to your valve that you just connected to your suction line. check your psi reading of your suction line under normal running conditions. to get a compartment temperature of minus 18deg celcius your psi reading depending on gas your fridge is charged with should be more or less 4,5 psi. if you have ice build up at the back of your fridge on your suction line your unit is overgased. if your reading on your guage reads less than zero psi then your unit is undergassed. good luck.

try cleaning a-coil

Is there a base valve or valve by the schrader?
It sounds like you have a restriction where the line starts to freeze up,like maybe there's a valve there thats not completely open, if not then you could be low on refrigerant or your metering device isn't opening completely.

Sorry to sat but the tech has no idea what he is doing. The metering device is in the discharge valve, making that line a low pressure, not high. If the "suction" line is hotthen it is running in heat mode.

If water is standing in the bin the drain is clogged. If water is raining down into the bin, Machine may not be level or the drain on the ice machine maybe partially clogged. If machine freezes up water will rain into bin too. Water fills ice machine while in harvest and continues to fill until ice machine`s suction reaches 49 degrees and the defrost timer times out.(usually 1-3 minutes after suction line reaches 49 degrees)