Bosch 800 Series HEI8056U (electric) / HII8056U (induction) 30-inch slide-in range: quick sheet

Covers: Bosch 800 Series 30-inch front-control slide-in ranges with a 4.6 cu. ft. convection oven and a warming drawer: HEI8056U (radiant glass-ceramic top, five elements) and HII8056U (induction top). Bosch support pages list several production (FD/version) variants for HII8056U (/01-/04). Both are marked no longer available by Bosch but are common in service. Read the E-Nr and FD number on the rating label (behind the warming drawer) before ordering parts.

Single sourceBrands: Bosch10 components

BSH-built European-style slide-ins: hardwired 208/240 V, no plug, electronic touch control for the oven and cooktop, European convection oven with 11 modes including proof and convection multi-rack, self-clean, and a separate warming drawer. The two models share the oven, warming drawer and cabinet; the top is either radiant elements on relays (HEI) or induction power modules (HII). Most service calls are supply/wiring issues after install, warming drawer faults, door lock after self-clean, and on HII the usual induction cookware and cooling issues.

Safety first

Hardwired 240 V: breaker off and verify before opening any panel.
Induction modules hold a high DC bus voltage after power-off; wait several minutes and verify (trained techs only).
A zone that will not turn off: kill the breaker immediately.
Do not run a cracked glass top.

How it works

Supply: both models are hardwired on 240/208 V; Bosch lists 14.8 kW (HEI8056U, 11.3 kW at 208 V) and 13.8 kW (HII8056U). Bosch's pages show 40 A protection, but a newer spec sheet revision for HEI8056U calls for 50 A while an older one says 40 A: size the breaker to the installation instructions that match the unit's FD number.

Oven: an electronic control reads an oven temperature sensor and drives bake, broil and a convection (rear) element with a fan through relays. Convection modes include bake, roast, multi-rack and broil. Self-clean locks the door and runs high heat with a cooling fan protecting the electronics.

HEI8056U cooktop: radiant ribbon elements under glass, switched by the touch control through relays; multi-ring elements switch extra rings for larger pans; hot-surface indicators are driven from element on-time.

HII8056U cooktop: induction coils driven by inverter power modules (high-voltage DC bus, high-frequency switching). Pan detection, overheating and supply monitoring follow the Bosch induction platform; read a fault by pressing and holding the affected zone's touch key, per Bosch support.

Warming drawer: a separate low-wattage element and control in the drawer cavity below the oven, running on the drawer's own mode in the oven control.

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Hand pressing the touch controls of a black induction cooktop by HONG SON, Pexels License

Diagnostic guides for this appliance

Guide · Range / Oven

Electric range trips the breaker or blows a fuse

Use the timing of the trip to split the problem. A trip at power-up, with every control off, points to the supply cord, terminal block, internal wiring or the breaker itself. A trip only when one element or mode is turned on points to that element (usually shorted to its sheath) or its switch and wiring. Rule out a weak or undersized breaker last, after the range itself tests clean.

8 steps ~60 minmoderate

Guide · Range / Oven

Electric range partly works: display on, oven or big elements won't heat

An electric range runs its electronics and lights on 120 V (one hot leg to neutral) but heats with 240 V across both legs. If one leg is lost, the range looks alive but cannot heat properly. Typical causes are half of the double-pole breaker tripped or failed, a burned terminal block or cord connection, or a damaged receptacle. A building on 208 V will heat, just more slowly.

7 steps ~45 minmoderate

Guide · Range / Oven

Oven keeps heating when turned off or overheats past setpoint

This is a fire hazard: turn the breaker off first, then diagnose. On electronic controls the usual cause is a relay on the control board whose contacts have welded closed. On dial ovens it is a stuck thermostat or selector contact. Less often a shorted sensor or harness is to blame. On gas ovens, a burner that won't shut off is a gas-valve problem and goes to a licensed gas technician.

7 steps ~60 minadvanced

Other ranges & ovens manuals

Manual · Range / Oven

GE JGBS66 / JGB735 30-inch freestanding gas range: quick sheet

GE 30-inch freestanding gas ranges with electronic touch oven control and 120 V supply: JGBS66 (and the lower JGBS60/JGBS61 family) with an under-oven broiler drawer and steam clean, and JGB735 (plus the JGB635/JGB645/JGB660 family) with an in-oven broil burner and self-clean. JGB735 adds a rear convection fan and No Preheat Air Fry. Finish/revision suffixes vary (SS, BB, WW, ES, DS and revision digits); confirm features against the rating label. Electrical and ignition side only: every gas-carrying part is blocked.

10 components7 common failuresGE

Manual · Range / Oven

Whirlpool WFG505M0B / WFG525S0J 30-inch freestanding gas range: quick sheet

Whirlpool 30-inch freestanding gas ranges with electronic touch oven control on the backguard and 120 V supply: WFG505M0B (5.1 cu. ft., under-oven broiler drawer, manual clean; revisions such as BS0/BS1/BS2, BW, BB and the later WFG505M0M) and WFG525S0J (5.0 cu. ft., in-oven top broil, self-clean; suffixes such as JS, JB, JW, JT, JV, JZ). Siblings WFG320 and WFG515 are built on similar chassis but check the ignition type per model (see overview). Electrical and ignition side only: every gas-carrying part is blocked.

9 components6 common failuresWhirlpool

Manual · Range / Oven

Frigidaire FCRG3052A and Gallery FGGF3036T/FGGF3059 30-inch gas ranges (electrical and ignition side): quick sheet

Frigidaire 30-inch freestanding gas ranges: FCRG3052A (AS/AB/AW, later FCRG3052B revisions; manual clean, no self-clean, storage drawer) and Gallery FGGF3036T (self-clean plus steam clean, convection fan) and FGGF3059T (Gallery, True Convection, self-clean plus steam clean). Electrical, ignition and control side only; every gas-carrying part is blocked. All listed models are discontinued and were sold roughly 2015-2021; match the full model and suffix on the rating plate (under the cooktop or on the storage drawer frame) before ordering parts.

10 components8 common failuresFrigidaire