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Spare parts for gas and oil burners and boilers: gas valves, nozzles, ignition electrodes and transformers, pressure switches, flame detectors, fuel pumps, servomotors and burner control boxes.

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Over 100,000 part numbers from every major manufacturer, brought into one structure so that parts from different brands can be compared and replaced.

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Yes. The order number, the manufacturer model and any supplier code all lead to the same part, so a number from an old invoice or a nameplate is enough.

What if the part is discontinued?

The catalogue records what the manufacturer replaced it with, and which parts from other brands do the same job — together with the conditions that apply.

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Honeywell Electronic control board SM16502U

SKU SM16502U Brand Honeywell

Photos

Key specifications

Catalogue article numbers	sm16502u, 534.568.718, 39817770
Country of origin	USA/Germany

all specifications (2) ↓

215.62 EUR

196.02EUR

in stock · 1

incl. 21% VAT · 162.00 EUR excl. VAT · shipping calculated at checkout

Worldwide shipping from stock
Original manufacturer part
Dispatch within 24 h for stocked items

Description

Honeywell Electronic control board SM16502U is a control board for gas and liquid fuel burners, boilers, and heat generators. This printed circuit board houses a controller that processes sensor signals, drives actuators, and enforces safety algorithms. It is manufactured by Honeywell and originates from the USA/Germany. Its SKU is SM16502U, and it is also known by the article numbers sm16502u and 39817770.

Further details

Application	wall-hung boilers and similar heating appliances
Control Functions	manage ignition sequence, enforce pre-purge and safety times, read pressure switches and flame signal, drive ignition transformer, gas valve, and fan
Interchangeability	not interchangeable across different series or models within the same brand
Microprocessor Based	printed circuit board with a controller
Output Drives	ignition transformer, gas valve, and fan
Safety Feature	puts the equipment into a safe state when faults are detected
Sensing Inputs	pressure switches and the flame signal

Choosing and fitting

Replacement control boards of this type are selected by exact series and type designation, supply voltage, programmed safety and pre-purge times, and the flame detection method (ionisation, UV, or IR). Even within the same brand, a board is not interchangeable across different series or models; a mismatch in safety time is a safety issue, not just a functional inconvenience. Before ordering, verify the original part number and the boiler model, and compare the board's connector layout and any fixed wires with the old unit.

Signs of failure

Typical failure modes for control boards of this type include error codes and burner lockouts, where the error code indicates an internal controller fault. The equipment may also fail to respond to commands or operate intermittently. Before replacing the board, check the power supply, wiring, and sensors to confirm that the controller is actually the cause.

All specifications

Catalogue article numbers	sm16502u, 534.568.718, 39817770
Country of origin	USA/Germany

Part numbers

SKU	SM16502U
Additional article	534.568.718