Not sure if you have everything covered with setting up a good brooder. Thought I throw in some guidelines.
Have heat source at one end of brooder, allowing the further end to be slightly cooler. This way chicks can find their comfort zone.
Keep feed crumbles, and water at cooler end.
If...
Your chicks can go without food for 2 or 3 days with no problem. Just hatch out all the rest,,,, which should be within day or two, and get the new heat source going. ASAP if you want happy chicks.
WISHING YOU BEST,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,and :welcome