ERROR
CODE
MEANING POSSIBLE CAUSE SOLUTION
E34 Low Voltage Error
Low Mains voltage will trigger this
error (below 167 V).
Investigate the reason for low voltage supply.
Re-establish correct voltage.
E37 Low Water Pressure
The water pressure is insufcient. Investigate the cause of the water pressure drop and
restart the boiler.
E41
Water Pressure Signal Time-Out.
Description:
The water pressure value is not refreshed often enough.
Loose link wire on the MaxSys
controller.
Check & re-secure wiring connections.
E45
TTB sensor* out of normal operating range (short
circuit)
Loose link wire on the MaxSys
controller.
Check & re-secure wiring connections.
E46
TTB sensor* out of normal operating range
(open circuit).
Loose link wire on the MaxSys
controller.
Check & re-secure wiring connections.
E47 Water Pressure Sensor* Error
Loose link wire on the MaxSys
controller.
Check & re-secure wiring connections.
E74
Solar sensor* out of normal operating range
(short circuit)
Loose link wire on the MaxSys
controller.
Check & re-secure wiring connections.
E75
Solar sensor out of normal operating range
open circuit
Internal error in the MaxSys
controller.
Replace the MaxSys controller.
E76
Gas Pressure Error
Description:
If the Gas Pressure Switch opens at any time for more than
5 s, Error 76 is generated and will switch off the system.
a) The Gas Pressure Switch is
faulty.
b) The gas pressure is too low.
a) Replace the Gas Pressure Switch.
b) Investigate and x gas supply.
E77 Condensate High Pressure (Blockage)
The condensate pipe has been
blocked and the water level has
risen to an unsafe level in the
heat exchanger.
Clear out the condensate piping system.
E78 Flapper does not open
a) A foreign body, or built up
contamination within the APS
apper house has built up.
b) The airway on the Venturi is
completely blocked.
a) Clean the APS apper housing. If the problem
persists, then change the APS apper housing.
b) Remove the obstruction from the airway.
* Not currently used in standard FHE setup
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