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Im late as always but i have few of 12706 modules and they range from 2,5 to 2,7Ω and one broken(fractured) sits at 200+Ω at 23º Celsius, resistance increases when you heat them but they should never go up to 120-150Ω, high resistance is a indicator of mechanical fracturing of the semiconductor pellets or broken soldering joint, i don't have the equipment to test them further at the moment but i can safely say that your Peltier is broken and your measurements are right, my conclusion: you just had a bad product that broke after some usage(should last more than 200,000h), you can just buy new module of replace it.

Late as always, resistance increases when Pelties heats up but should never go up to 120-150Ω, high resistance is a indicator of mechanical fracturing of the semiconductor pellets or broken soldering joint, your measurements are right and you just had a bad product that broke after some usage(should last more than 200,000h), you can just buy new module of replace it.

Im late as always but i have few of 12706 modules and they range from 2,5 to 2,7Ω and one broken(fractured) sits at 200+Ω at 23º Celsius, im not sure if they "toast" as i have never broken one by using it without or using just one heatsink, resistance increases when you heat them but they should never go up to 120-150Ω, high resistance is a indicator of mechanical fracturing of the semiconductor pellets or broken soldering joint, i don't have the equipment to test them further at the moment but i can safely say that your Peltier is broken and your measurements are right, my conclusion is that you just had a bad product that broke after some usage, you could get more powerful one and limit your PSU's current if you want it to last long.

Im late as always but i have few of 12706 modules and they range from 2,5 to 2,7Ω and one broken(fractured) sits at 200+Ω at 23º Celsius, resistance increases when you heat them but they should never go up to 120-150Ω, high resistance is a indicator of mechanical fracturing of the semiconductor pellets or broken soldering joint, i don't have the equipment to test them further at the moment but i can safely say that your Peltier is broken and your measurements are right, my conclusion: you just had a bad product that broke after some usage(should last more than 200,000h), you can just buy new module of replace it.

Im late as always but i have few of 12706 modules and they range from 2,5 to 2,7Ω and one broken(fractured) sits at 200+Ω at 21º Celsius, im not sure if they "toast" as i have never broken one by using it without or using just one heatsink, resistance increases when you heat them but they should never be at 120-150Ω, high resistance is a indicator of mechanical fracturing of the semiconductor pellets or broken soldering joint, i don't have the equipment to test them further at the moment but i can safely say that your Peltier is broken and your measurements are right.

Im late as always but i have few of 12706 modules and they range from 2,5 to 2,7Ω and one broken(fractured) sits at 200+Ω at 23º Celsius, im not sure if they "toast" as i have never broken one by using it without or using just one heatsink, resistance increases when you heat them but they should never go up to 120-150Ω, high resistance is a indicator of mechanical fracturing of the semiconductor pellets or broken soldering joint, i don't have the equipment to test them further at the moment but i can safely say that your Peltier is broken and your measurements are right, my conclusion is that you just had a bad product that broke after some usage, you could get more powerful one and limit your PSU's current if you want it to last long.