Bosch is a leading brand of household appliances in the world market. Once a small company founded in 1886 by an engineer-electrician, at present, the company is among the world’s leading suppliers of consumer products, including boilers. The slogan of the company is: “Better to lose in profit than in trust of our buyers,” – is reflected throughout everything, including its troubleshooting system. It is represented below in a chart form.
Bosch WM 12 boiler troubleshooting
PROBLEM | POSSIBLE CAUSE | CORRECTIVE ACTION |
---|---|---|
Chain saw fails to operate | Kickback brake is activated | Pull activation lever for kickback brake (hand guard) 5 back in position O |
Plug not connected | Connect plug | |
Mains socket faulty | Use another socket | |
Extension cable damaged | Check cord, replace | |
Fuse faulty/blown | Replace fuse | |
Chain saw operates intermittently | Extension cable damaged | Check cord, replace |
External or internal wiring defect | Contact your Bosch Service Centre | |
On/Off switch 2 defective | Contact your Bosch Service Centre | |
Saw chain dry | No oil in reservoir | Refill oil |
Vent in oil filler cap 4 clogged | Clean oil filler cap 4 | |
Oil passage clogged | Clean oil passage | |
Brake does not stop saw chain | Kickback brake/run-down brake defective | Contact your Bosch Service Centre |
Saw chain/guide bar hot | No oil in reservoir | Refill oil |
Vent in oil filler cap 4 clogged | Clean oil filler cap 4 | |
Oil passage clogged | Clean oil passage | |
Chain tension too high | Tension saw chain | |
Dull saw chain | Sharpen saw chain or replace | |
Chain saw rips, vibrates, | Chain tension too loose | Tension saw chain |
does not saw properly | ||
Dull saw chain | Sharpen saw chain or replace | |
Chain worn out | Replace saw chain | |
Chain teeth are facing in the wrong direction | Reassemble with chain in correct direction |
Bosch R 30 boiler troubleshooting
PROBLEM | CAUSE | REMEDY |
---|---|---|
Desired room temperature is not reached | Thermostatic valve(s) set too low | Increase thermostatic valve setting (s) |
Temperature control for CH flow set too low | Increase CH flow temperature control setting | |
Air trapped in heating system | Bleed radiators and heating system | |
Desired room temperature exceeded by large amount | Radiators are too hot | Turn down thermostatic valves |
Temperature rises instead of falling | Clock is incorrectly set | Check setting |
Room temperature too high in Economy mode | Building retains heat well | Start Economy mode sooner |
No display or display unit does not respond | Momentary power failure | Switch off appliance at master switch, wait a few seconds and switch on again |
Storage Tank doesn’t warm up | Temperature control is too low | Turn the temperature control to the desired temperature |
Bosch ZBR35-3A boiler troubleshooting
PROBLEMS | CAUSE/SOLUTIONS |
---|---|
Combustion noise too loud; rumbling noises | * Insert code plug correctly; replace if defective. |
* Check gas type. | |
* Check inlet gas pressure; adjust if defective. | |
* Check flue gas system; clean or repair if defective. | |
* Check gas/air ratio in the combustion air and flue gas; replace gas valve if defective. | |
Flow noises | * Set pump speed correctly to match maximum output. |
* Set pump mode. | |
Heating-up takes too long | * Set pump speed correctly to match maximum output. |
* Set pump mode. | |
Flue gas readings incorrect; CO levels too high | * Check gas type. |
* Check inlet gas pressure; adjust if defective. | |
* Check flue gas system; clean or repair if defective. | |
* Check gas/air ratio in flue gas; replace gas valve if defective. | |
Violent ignition, poor ignition | * Check gas type. |
* Check inlet gas pressure; adjust if defective. | |
* Check power supply. | |
* Check electrodes for visual damage; replace if defective. | |
* Check flue gas system; clean or repair if defective. | |
* Check gas/air ratio; replace gas valve if defective. | |
* Check gas valve; replace if defective. | |
* Check burner; replace if required. | |
DHW has unpleasant odor or has a dark color | * Perform thermal disinfection of the DHW circuit. |
* Replace sacrificial anode in the tank (if installed). | |
* Consult local water department. | |
Set supply temperature (e.g. of the FW200 control) exceeded | * Switch off automatic anti-cycle timer, i.e., set value to 0. |
* Set the required anti-cycle timer, e.g. default setting of 3 minutes. | |
Condensate in air box | * Insert diaphragm in the mixer unit per installation instructions; replace if defective. |
DHW temperature is not reached (combi boiler 2WB..-3A only) | * Insert code plug correctly; replace if defective. |
* Check whether voltage (120 VAC) is present between terminal 1 and terminal 3; repair if defective. | |
* Check turbine; replace if defective. | |
Heatronic is flashing (i.e. all buttons, all display segments, burner indicator etc. are flashing) | * Replace fuse Si 3 (24 V) (6.3 A fuse according to IEC default). |