Have you noticed that your Bosch hot water system is flashing an odd code? Don’t worry; our knowledgeable staff at Canberra Hot Water Systems is available to assist you in quickly resolving Bosch error codes, which are built-in diagnostics that aid in the early identification of problems.
We specialise in identifying and fixing all Bosch error codes in Canberra and the surrounding areas, regardless of whether you have a Bosch gas continuous flow system or another Bosch model. Without any guesswork, delays, or chilly showers, we’ll get your hot water flowing smoothly once more.
Fault Condition : Something in the units’ neutraliser is clogged.
Item to check : Try resetting the controller by turning the main power off and on.
Book Service, Call 1800 633 920
Fault Condition : Abnormal combustion or law gas supply pressure.
Item to check : Turn the control unit off, turn the hot water tap on and turn the control unit on.
Book Service, Call 1800 633 920
Fault Condition : The water heater’s neutraliser is in need of replacement.
Item to check : Get in touch with a plumber to replace the neutraliser.
Book Service, Call 1800 633 920
Fault Condition : Your hot water system has shut down due to abnormal combustion.
Item to check : If turning the main power off and on again does not work, you will need to get in contact with a qualified plumber with experience in hot water systems.
Book Service, Call 1800 633 920
Fault Condition : There is a problem with your heaters hot and cold sensors.
Item to check : Turn the unit off, turn on the hot water tap and turn the power back on. Replace the sensor and/or wire is problem persists.
Book Service, Call 1800 633 920
Fault Condition : The temperature within the hot water unit is hotter than average.
Item to check : Call a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Fault in the flue gas limiter
Item to check : Call a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Wire harness defect.
Item to check : Call a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : The air temperature sensor is faulty.
Item to check : Call a qualified plumber
Book Service, Call 1800 633 920
Fault Condition : Condensing unit flue temperature sensor disconnected or damaged
Item to check : Replace the sensor and/or wire connections with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Inlet cold water temperature sensor disconnected or damaged.
Item to check : Replace the sensor and/or wire connections with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : The water temperature sensor is faulty.
Item to check : Replace the sensor and/or wire connections with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Outlet hot water temperature sensor disconnected or damaged.
Item to check : Replace the sensor and/or wire connections with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : No hot water or inconsistent temperatures.
Item to check : Turn the power off, turn on the hot water and turn the power back on. If this doesn’t work, check the gas supply pressure with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Condensing unit flue gases temperature too hot.
Item to check : Check flue gas temperature sensor, water inlet temperature sensor, and descale the tankless water heater with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Flue blockage detected during startup
Item to check : Reset error (press and hold on/off button for 3 seconds). If issue persists, Check air openings and exhaust opening for obstructions and reset. Check if flue length is according to manual specification and reset the system to clear error. Check if the air filter is dirty or clogged, replace it if needed. Perform gas and air tuning according to manual, or with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Fan calibration triggered due to missed ignitions
Item to check : Check gas inlet pressure and perform gas and air tuning with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Successive fan calibration with similar learned values.
Item to check : Check gas inlet pressure and perform gas and air tuning with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Little to no air flow meaning that the heater cannot start up.
Item to check : Turn the hot water tap on to its full capability and then turn it off. Then turn the system on and off.
Book Service, Call 1800 633 920
Fault Condition : Flow sensor does not detect water recirculation.
Item to check : Check pump and connections, then check recirculation circuit for any blockage.
Book Service, Call 1800 633 920
Fault Condition : Bypass water valve disconnected or damaged.
Item to check : Check bypass water valve wire connections, if error continues, Replace the bypass water valve and/or wire connections with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Primary fan rotation too low
Item to check : Check gas pressure. Low gas pressure may cause the fan to change its speed to meet desired temperature. Possible defective control unit call a qualified plumber to fix the issue.
Book Service, Call 1800 633 920
Fault Condition : A faulty fan, only cold water will be able to be used.
Item to check : Replace the fan and/or wire connections with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Main water valve disconnected or damaged.
Item to check : Check main water valve wire connections, if error continues, Replace the main water valve and/or wire connections with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Barometric pressure sensor damaged.
Item to check : Reset error, if problem persists, replace electronic control unit (ECU) with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Water Flow Fault
Item to check : Disconnect power supply cord and check wire connections on water valve and the two connectors on the control board. Excessive water pressure/flow, call a qualified plumber to fix the issue.
Book Service, Call 1800 633 920
Fault Condition : Excessive flue blockage detected
Item to check : Excessive flue blockage detected during operation due to excessive pressure on the siphon. Check exhaust pipes and terminals for obstructions and reset the error.
Book Service, Call 1800 633 920
Fault Condition : Excessive flue blockage detected during operation due to insufficient combustion air.
Item to check : Check air intake and exhaust pipes and terminals for obstructions and reset the error.
Book Service, Call 1800 633 920
Fault Condition : Electronic control unit internal error.
Item to check : Reset error, if problem persists, replace electronic control unit (ECU) with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Hot water temperature above 90°C
Item to check : Disconnect the appliance and purge hydraulic circuit to remove air, if problem persists, reduce set point temperature to minimise temperature instabilities with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Cold water temperature sensor fault
Item to check : Check connector on wires coming from top of water valve for a secure connection, Sensor may trip if water temperature drops below 2°C. Protect heater from freezing conditions.
Book Service, Call 1800 633 920
Fault Condition : Exhaust temperature sensor
Item to check : Descale the tankless system, reset error, if problem persists, check sensor resistance and replace the sensor with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Backflow Temperature Sensor
Item to check : Check inlet/outlet vent pipes, check if secondary fan connections are disconnected, check venting specifications are met. Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure.
Book Service, Call 1800 633 920
Fault Condition : Condensing unit flue gases temperature too hot.
Item to check : Descale the tankless system, reset error, if problem persists, check sensor resistance and replace the sensor with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Electronic control unit internal error.
Item to check : Reset error, if problem persists, replace electronic control unit (ECU) with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Error during ionization test
Item to check : Error during ionization test. Electronic control unit internal error, replace electronic control unit (ECU) with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Thermal fuse broken
Item to check : Replace thermal fuse with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Ignition failure.
Item to check : Check gas inlet pressure and perform gas and air tuning with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Electronic control unit internal error
Item to check : Reset error, if problem persists, replace electronic control unit (ECU) with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Flame lost during operation.
Item to check : Check gas inlet pressure and perform gas and air tuning with the help of a qualified plumber.
Book Service, Call 1800 633 920
Fault Condition : Gas valve modulation solenoid disconnected
Item to check : Check gas valve wire connection, if problem persists, replace the gas valve and/or wire connections and or electronic control unit (ECU). For gas valve replacement, perform gas and air tuning with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Wrong gas connected.
Item to check : Wrong gas connected (LPG instead of Natural Gas) for current appliance configuration, check gas type.
Book Service, Call 1800 633 920
Fault Condition : Electronic control unit internal error
Item to check : Reset error, if problem persists, replace electronic control unit (ECU) with the help of a qualified technician.
Book Service, Call 1800 633 920
Fault Condition : Ionization error at standby
Item to check : Loose connection to the flame ionization rod. Verify that the thinner wire leading from the control unit is securely connected to the set of electrodeslocated on the lower front of the heat exchanger, flame ionization rod or control unit may be damaged, call a qualified technician to rectify the issue.
Book Service, Call 1800 633 920
Bosch error codes are built into your device as automated fault alerts. The system shows a code to help identify the issue when something isn’t functioning properly, such as the water flow, temperature control, or ignition.
Anything from a straightforward reset problem to a more significant mechanical or electrical malfunction can be indicated by these codes. The first step to properly fixing it is to understand what they mean.
Note the error code that appears on the screen of your system.
Give Canberra Hot Water Systems a call, and we’ll quickly diagnose and resolve the issue.
We at Canberra Hot Water Systems specialise in Bosch hot water systems. We have years of experience servicing Bosch gas and electric units, and we have the equipment, technical know-how and original parts to get your problem fixed fast.
We have the solution whether you’re seeing Bosch error codes 11, 65, 90, or anything else.
