One room cools fine alone, but both weaken together. That could be normal load sharing on a smaller system — or it could mean the compressor can no longer hold dual demand. The recovery speed after turning one room off tells you which.
SAFETY WARNING
Stop using the unit and contact a technician if you notice burning or electrical smell, breaker tripping repeatedly, or harsh abnormal outdoor noise.
With two rooms active, available cooling must be shared. During higher room load, both rooms can feel weaker.
We compare outlet temperatures in single versus dual mode to confirm the drop is within normal sharing range for the system size. A shared-demand pattern is not always a hardware failure.
If flow distribution is uneven, one room may keep more cooling while the other falls off quickly. The gap becomes obvious in dual operation.
We measure refrigerant pipe temperatures at each indoor unit to confirm whether flow is splitting evenly or favoring one side. Treating imbalance as a single-part failure too early can miss the real path.
A weak compressor or control path can cope with light demand but fail under combined indoor load.
We test compressor current and discharge pressure under multi-load to identify whether the outdoor unit is hitting its capacity limit. Approving broad replacement without multi-load checks can overshoot the needed fix.
Different room heat load and size can make cooling look uneven when both rooms are active.
If this pattern keeps worsening, move to diagnosis early.
Just observe, no disassembly required:
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Describe what’s happening. We’ll work out the likely cause and tell you the right next step.
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