- Appliances
- Refrigerators
Er dH
LG Er dH on a refrigerator: defrost failure
Risk level
Medium
Proceed carefully and stop if the check is unclear.
Urgency
Medium
Quick answer
LG says dH is a defrost failure. If melt water does not reach the drain tray because the drain hole is frozen, unplug it with the doors open so the ice melts.
Safety first
Stop and check this first
- Do not chip the ice with sharp objects to speed things up: you can damage internal ducts and parts. Let it melt with the appliance unplugged.
- A fan code does not point to the refrigerant circuit. If anyone proposes opening that circuit, it must be a technician certified for refrigerants, backed by measurements.
Safe checks you can perform
- Food moved to another refrigerator
- Defrost with doors open
- Code repeating
Leave these tasks to a qualified professional
- Do not attempt this professional task: Measure the defrost heater and thermal fuse
- Do not attempt this professional task: Clear the drain and assess the board
What a technician must be able to justify
A technician is coming
These are the steps they must carry out and show you. Tick them as they work: if steps are skipped, do not accept a part swap.
These are not instructions for opening or handling the equipment yourself. They are the checks that should support a technical conclusion.
Measure the defrost heater and thermal fuse
What they doWith the appliance unplugged, the technician measures the continuity of the heater and the thermal fuse with a multimeter.
They must show youthe measured values against the manufacturer's specification.
In writingwhich part was open and its part number.
Clear the drain and assess the board
What they doThe technician clears the drain hole and, if heater and fuse measure correctly, checks whether the board triggers defrosting.
They must show youwater reaching the tray and a defrost test.
In writingthe work done and the reason for any part change.
Before accepting a part or repair
Nothing has been shown yet. Do not accept a part swap based on the code alone.
Checks and evidence, step by step
Follow the documented order. An error code identifies the affected system, but it does not prove by itself which part has failed.
- 1
Food moved to another refrigerator
No special tools
Procedure
- Who:
- you.
- How:
- if you have another refrigerator, move the food into it.
- Result that matters:
- being able to defrost without losing food.
- If you have nowhere to keep it:
- LG recommends having a technician check it.
- If it is out:
- unplug.
- Evidence to keep:
- none.
Evidence: LG USA refrigerator F dH or r dH error code troubleshooting
- 2
Defrost with doors open
No special tools
Procedure
- Who:
- you.
- How:
- unplug the refrigerator and leave the freezer or refrigerator door wide open: the ice takes a day in summer and three days in winter to melt.
- Result that matters:
- that the ice melts completely.
- If water runs to the drain tray again:
- the hole was frozen.
- If water still does not reach the tray:
- tell the technician.
- Evidence to keep:
- dates of the defrost.
Evidence: LG USA refrigerator F dH or r dH error code troubleshooting
- 3
Code repeating
No special tools
Procedure
- Who:
- you.
- How:
- after plugging it back in, watch whether dH appears again.
- Result that matters:
- whether the code repeats.
- If it does not:
- the likely cause was ice.
- If it repeats:
- LG says to have a technician check it for an accurate diagnosis.
- Evidence to keep:
- photo of the code and the date.
Evidence: LG USA refrigerator F dH or r dH error code troubleshooting
Where this code applies
A code is meaningful only inside the right product and version context.
Primary scope
- System
- Appliances
- Brand
- LG
- Product type
- Refrigerators
Known code variants
- dH
- Er DH
- Error dH LG
- F dH
- LG dH error
- r dH
What it means
LG explains that F dH or r dH mean a freezer or refrigerator defrost failure. It appears when the compartment's normal temperature is not detected some time after defrosting started. LG lists ice build-up, a blocked drain hole, a disconnected thermal fuse, a disconnected heater or a main board failure as causes. Only the first two have a user step; the code does not say which one applies.
Warnings and stop conditions
- Mediumeditorial warning
Do not chip the ice with sharp objects to speed things up: you can damage internal ducts and parts. Let it melt with the appliance unplugged.
Evidence: LG USA refrigerator F dH or r dH error code troubleshooting
- Mediumeditorial warning
A fan code does not point to the refrigerant circuit. If anyone proposes opening that circuit, it must be a technician certified for refrigerants, backed by measurements.
Evidence: LG USA refrigerator F dH or r dH error code troubleshooting
Symptoms and causes
Probable causes · in order
- Ice build-up or blocked drain holeCommon
If melt water does not reach the drain tray, LG says this error may appear. It is the cause you can fix.
Evidence: LG USA refrigerator F dH or r dH error code troubleshooting
- Thermal fuse or defrost heater disconnectedPossible
LG names them as causes. Only a technician's measurement checks them.
Evidence: LG USA refrigerator F dH or r dH error code troubleshooting
- Main board failurePossible
LG includes it among the causes. It is considered only when heater and fuse measure correctly.
Evidence: LG USA refrigerator F dH or r dH error code troubleshooting
Virtual technician
Does Er dH still appear after these checks?
Answer a few questions to narrow down the likely cause and the safest next action. Guidance only - it never replaces a professional.
Sources and technical references
- 1
LG USA refrigerator F dH or r dH error code troubleshooting
LG Electronics · 2023 · official_doc
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