This excerpt from the user's manual can explain the problem of your transformer.
"... Your oven has 3 DOUBLE cooking functions, which combine convection heat and heat from the upper or lower rack with microwave power. To select the DOUBLE cooking function, turn the COOKING MODE knob until the desired power setting appears on the display, then set the desired cooking time first. The microwave power settings can be increased from 90 W to 450 W in three steps. Microwave stand HIGH MEDIUM / HIGH MEDIUM / LOW ( ) HIGH / LOW COMBI I COMBI II COMBI III 900 W 600 W 450 W 300 W 180 W 100 W 600 W 450 W 300 W Power grill NL 1300 W 1300 W 1300 W 1300 W 3. If you select a higher power setting, you must set a shorter cooking time. If you reduce the power, choose a longer cooking time...."
BLUESKY BMG900ESL23, BMG900ESL220, BMG900ESL2255, BMG900ESL22110, BMG900ESL22165, BMG900ESL22220
Manufacturer's part price is £64.59 Discount for bulk (starting at 10 units), £62.46 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
② Start search
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Here are examples for partial reference for microwave oven :
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