Fault Indications - MHS Boilers 318 Operating & Maintenance Manual

- Open the lid (the arrow at the bottom of the LCD display indicates parameter P1)
- Push the Reset/Programming key (pos. 3), the LED will light, turn the rotary switch (pos. 5)
until the desired water flow temperature has been reached
- Push the Reset/Programming key, the LED will go out
- Close the cover.
Setting the flow temperature for Domestic Hot Water (cover open)
- Open the lid
- Turn the rotational switch (pos.5) clockwise until the arrow at the bottom of the LCD display
indicates parameter P2
- Press the Reset/Programming key (pos. 3), the LED will light, turn the rotary switch until the
desired Domestic Hot Water flow temperature has been reached
- Push the Reset/Programming key, the LED will go out
- Close the cover.

6.4 Fault indications

A fault always results in a flashing
fault occurs, the cause must always be found and corrected before the related protective function
is reset. The operating signal (terminals 12 - 13) falls off if a fault has occurred more than 2 times
within 6 minutes (the fault code will appear in the display with a "3") or if a fault is longer than 6
minutes active. The boiler can be nevertheless in operation.
The high limit thermostat has operated. The boiler temperature has exceeded 100°C. Press
1
the reset button.
The interlocking input has been interrupted. Correct the external error and press reset.
2/3
Flame signal fault. No flame detected at burner start. One restart possible. Correct fault and
4
press reset.
Flames go out during operation. If this fault occurs 3 times within 6 minutes, the fault becomes
5
interlocking. Correct the fault and press reset.
Temperature protection has operated. The boiler temp. has exceeded the setting. Press
6
reset.
The lockout input has been interrupted. Correct the external fault and press reset.
7
Error in flame signal. A flame has been detected during start-up. Correct the fault and press
11
reset.
Flow temperature sensor is faulty. Correct fault.
12
Wiring of the CXE/EM extension module is defective. Correct fault.
13
Hot water temp. sensor is defective. Correct fault.
14
External temp. sensor is defective. Correct fault.
15
Header temp. sensor is defective. Correct fault.
18
Error in the control of gas valve 1. After burner has stopped a flame has been detected for a
20
MHS Boilers Ltd ©
symbol and a fault code appearing in the display. When a
230307 50