This excerpt from the user's manual can explain the problem of your heating element.
"... Defrost; select this power level to ensure that food defrosts evenly. P = Percentage To adjust the power level: Turn the TIMER / WEIGHT / POWER LEVEL knob clockwise to select a cooking time. 50 P (400 W) For compact dishes, which require a long traditional cooking time, e.g. beef dishes, it is advisable to reduce the capacity and extend the cooking time slightly. 30 P (240 W) Select a low power level for defrosting...."
BLUESKY BMG900ESL23, BMG900ESL220, BMG900ESL2255, BMG900ESL22110, BMG900ESL22165, BMG900ESL22220
Manufacturer's part price is £26.84 Discount for bulk (starting at 10 units), £25.95 per unit
This manufacturer part is recomended by BLUESKY, which gives it a 10/10 rating.
This spare part is recommended for your BLUESKY BMG900ESL23 microwave oven .
All spare parts are new and come with a 1 year warranty
① Carefully check your BLUESKY microwave oven's product number
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