A/C ice build up, please help troubleshooting
#1
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A/C ice build up, please help troubleshooting
Hi folks,
This is my first summer after moving into this house. The A/C is running okay but has one problem, everytime after 40 min of running, the ice starts building up on the evaporator coil and spreading to the law pressure hose. I have checked the air flow, not much of restriction. The blower motor runs fine, it can run for hours with a good speed without problem. I used an app to measure the wind speed at the register, it runs at 9 m/sec for hours without A/C on. However, if the A/C cooling is on, it runs for good speed for 40 min then the wind speed start reducing coincide the ice forming. The temperature at the register goes from 70 degree F when A/C kicked in, and stayed at 70 for 35 min, then starts slowly going up from 70 to 74 and stays there unless ice was melt. I don't know what could cause this, low refrigerant? I live in south of Ohio, summer here is around 90F.
The heating/blower system made by Williamson and the A/C compressor by Ducane. The A/C compressor and evaporator coil looks like new or close to new.
Please help me troubleshoot.
Many thanks,
Frank
This is my first summer after moving into this house. The A/C is running okay but has one problem, everytime after 40 min of running, the ice starts building up on the evaporator coil and spreading to the law pressure hose. I have checked the air flow, not much of restriction. The blower motor runs fine, it can run for hours with a good speed without problem. I used an app to measure the wind speed at the register, it runs at 9 m/sec for hours without A/C on. However, if the A/C cooling is on, it runs for good speed for 40 min then the wind speed start reducing coincide the ice forming. The temperature at the register goes from 70 degree F when A/C kicked in, and stayed at 70 for 35 min, then starts slowly going up from 70 to 74 and stays there unless ice was melt. I don't know what could cause this, low refrigerant? I live in south of Ohio, summer here is around 90F.
The heating/blower system made by Williamson and the A/C compressor by Ducane. The A/C compressor and evaporator coil looks like new or close to new.
Please help me troubleshoot.
Many thanks,
Frank
#2
Welcome to the forums.
It sounds like you've covered low airflow pretty well.
Unfortunately that leaves you low on a refrigerant charge.
You'll need to have the system checked for a leak and a recharge.
It sounds like you've covered low airflow pretty well.
Unfortunately that leaves you low on a refrigerant charge.
You'll need to have the system checked for a leak and a recharge.