New home, new appliances, new problems. I have a Bosch HBN455AUC/01 electric double oven. . . ~10 years old. The top oven is convection/conventional; the bottom oven is conventional only. Both ovens have a self-cleaning option which I do not plan to use. Neither oven will reach the set temperature - both seem to be low by ~50 degrees.
Despite being rather new, this oven appears to be quite conventional - set a dial to temperature, turn the oven ON, BAKE, BROIL, etc. There is a timer but very little digital involvement. The top oven has 3 convection options which seem to speed up the fan; but the fan runs on lower speed any time any oven is in use. After checking, all the heating elements appear to work (glow red). The low-speed fan works okay and the high-speed fan (or maybe one single fan turned to high) works okay.
After looking at the parts schematic, there are four sensors of interest:
2 are listed as 'thermometers' - adjustable units located behind the front control panel. Each thermometer unit has a long cable terminating in a sensor bulb. The cable runs around the cabinet, enters through the back edge to the bulb mounted next to the broiler element. In the pic below, I've listed them as A and B (A is upper oven, B lower).
2 more sensors are listed as 'thermostats'. These are long probes, mounted by 2 screws, that enter from the rear of the cabinet. They mount alongside the broiler element, just outboard of the thermometer bulbs. I labeled them C and D (only one part is shown, but there is an identical probe in the lower oven - both have same part number).
PROBLEMS: neither oven gets fully up to heat - heat light turns OFF before set temperature is reached (by ~ 50 degrees F). Same result convection or conventional. Both ovens seem very slow to heat.
SOLUTION SO FAR: I've checked the burner elements and fans. Tomorrow, I plan to remove both thermostats and check them for resistance (~1100 ohms at room temperature and some greater resistance at 212 deg F.)
At least one article I read said the thermostats (C + D) are only used during the self-cleaning cycle. The thermometers (A + B) actually control heat during normal use. Does anybody know about this?
I am confused as to why there are two different sets of temperature sensing equipment essentially doing the same or similar job. Did I miss something? Are there other sensors that I'm missing altogether?
If I check the thermostats (C + D) for resistance and they test okay, what should I do next?
Thanks.
Despite being rather new, this oven appears to be quite conventional - set a dial to temperature, turn the oven ON, BAKE, BROIL, etc. There is a timer but very little digital involvement. The top oven has 3 convection options which seem to speed up the fan; but the fan runs on lower speed any time any oven is in use. After checking, all the heating elements appear to work (glow red). The low-speed fan works okay and the high-speed fan (or maybe one single fan turned to high) works okay.
After looking at the parts schematic, there are four sensors of interest:
2 are listed as 'thermometers' - adjustable units located behind the front control panel. Each thermometer unit has a long cable terminating in a sensor bulb. The cable runs around the cabinet, enters through the back edge to the bulb mounted next to the broiler element. In the pic below, I've listed them as A and B (A is upper oven, B lower).
2 more sensors are listed as 'thermostats'. These are long probes, mounted by 2 screws, that enter from the rear of the cabinet. They mount alongside the broiler element, just outboard of the thermometer bulbs. I labeled them C and D (only one part is shown, but there is an identical probe in the lower oven - both have same part number).
PROBLEMS: neither oven gets fully up to heat - heat light turns OFF before set temperature is reached (by ~ 50 degrees F). Same result convection or conventional. Both ovens seem very slow to heat.
SOLUTION SO FAR: I've checked the burner elements and fans. Tomorrow, I plan to remove both thermostats and check them for resistance (~1100 ohms at room temperature and some greater resistance at 212 deg F.)
At least one article I read said the thermostats (C + D) are only used during the self-cleaning cycle. The thermometers (A + B) actually control heat during normal use. Does anybody know about this?
I am confused as to why there are two different sets of temperature sensing equipment essentially doing the same or similar job. Did I miss something? Are there other sensors that I'm missing altogether?
If I check the thermostats (C + D) for resistance and they test okay, what should I do next?
Thanks.
via HBN455AUC/01 Bosch Double Oven - Temperatures too low in both ovens
by Dave5358
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