If your heater is new (less than 12 months old), contact your installer to discuss the system design and operation.
If your heater is older than 12 months, increase the SET temperature. Check return air grill is clear and if a filter is fitted the filter is clean, fan speed is set to max, all outlets are open and not obstructed. If you have tried the above and your heater is still not working your heater may need to be serviced.
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