Baxi MainEco Heat 15 Service Manual download pdf (Page 57)

7215845 - 01 (08/14) MainEco Heat 57

Troubleshooting 11

Remedial actions by service

engineer

Status

signal

Description Possible cause s

1 flash

red

Sensor error

•Bad connection to flow or

return temperature sensor

•Fault with flow or return

temperature sensor(s)

•Low or no flow through boiler

• Reverse flow through boiler

•Check connections to

temperature sensors/PCB and

condition of wiring loom

•Check resistance

temperature sensors

•Check pump operation and

system circulation

2 flashes

red

High

temperature

protection

• Over-temperature thermostat on

heat exchanger activated

•No water flow through heat

exchanger

• Over-temperature thermostat

fault or bad connection (open

circuit).

•PCB over-temperature condition

•Flue fault resulting in

recirculation or activation of air

pressure switch (if fitted)

•Check connections to and

operation of O/T thermostat

and air pressure switch (if

fitted) and PCB and condition

of wiring loom

•Check system pressure or that

system is not air- locked

•Check pump operation and

system circulation

•Check flue co ndition

3 flashes

red

Ignition fault

•No ignition

•No flame detected following

ignition

•False flame signal detected

• Repeated loss of flame detected

•Check earthing of the appliance

•Check ignition electrode

condition and clean/replace if

necessary

•Check gas valve operation

•Check flue condition

•Check correct

combustion/gas

valve settings

4 flashes

red

Fan fault

•Fan calibration error

•Fan failure

• If fan operates, check flue

installation and condition.

•Replace control/fan assy

5 flashes

red

Parameter fault

•Bad connection to PU

• Parameter error or faulty PU

•

PCB and condition of wiring

loom

•Replace PU and recommission

6 flashes

red

Miscellaneous

•Bad connection or wiring fault

internal or external to the boiler

• Parameter error

• Communication error

•Check all wiring connections

are

correctly made

• Using a service tool or Recom

software chec k all parameter

settings

• If necessary replace PU

and/or control/fan assy

•Check condensate drain for

blockage

Lock-out conditions (Red flashes on “chimney sweep”)

The following TABLE describes the conditions that may result in

a lock-out condition and red flashing signal being displayed.

To reset a lock-out condition press and hold the reset button

until the fault indication flashes rapidly and goes out.

NOTE: a lock-out condition can be re-set up to 5 times within

one hour using the reset button. Any repeating fault should be

fully investigated and appropriate remedial actions taken by a

Gas Safe registered service engineer.

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Baxi MainEco Heat 15 Service Manual Page 57

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