# AGA insulation degradation — long heat-up, high running cost, low hotplate output > AGA insulation degradation — long heat-up, high running cost, low hotplate output: symptoms, likely causes and how a technician diagnoses it. Occasional AGA issue. Mon–Sun 8:00AM–8:00PM. Call or text 206-427-7323. - HTML page: https://aga.repair/aga-insulation-loss/ - Markdown version: https://aga.repair/aga-insulation-loss.md - Site: Appliance Repair Pros (https://aga.repair) — 206-427-7323 — Mon–Sun 8:00AM–8:00PM ## On this page - Symptoms - Likely causes - Diagnosis - Parts - Related error codes - Appliances affected - FAQ