Lochinvar EcoForce EF80 Installation, Commissioning, User And Maintenance Instructions page 105

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F19
Reason:
Cause:
There is too much resistance in the flue gas circuit causing high pressure in the heat exchanger at the flue gas
side.
Corrective action:
Check if the flue gas system is blocked.
Extreme fouling of the heat exchanger also causes the resistance to rise. Check the state of the heat exchanger
and clean if necessary.
Check the flue gas system diameter & length (most likely in a new system).
Cause:
The condensate drain system is blocked. The condensate will build up above the measuring point of the
pressure switch and creates a static pressure larger than the measuring point.
Corrective action:
Check if the condensate drain hose between the heat exchanger and the siphon is open, so the condensate
can flow freely to the siphon.
Check if the siphon is free of debris that might block the condensate flow and clean the siphon if necessary.
Check the condensate drain hose between the siphon and the condensate drain point in the external
installation. Condensate must be able to flow freely.
Cause:
The condensate drain hose must have an open connection to the external system. If not, pressure fluctuations
in the building drainage system can have effect on the pressure in the heat exchanger of the water heater.
Corrective action:
Make sure that there is an open connection between the siphon hose and the drainage system of the building
installation. The condensate should flow in the drainage system through a freely "breathing" connection, so
pressure fluctuations of the external drainage system cannot affect the pressure in the heat exchanger of the
water heater.
Cause:
Blockage of the pressure signal hose going to the pressure switch.
Corrective action:
Check the pressure signal hose and clean or replace it if necessary.
Cause:
Bad pressure switch causing a fault signal.
Corrective action:
Replace the pressure switch.
Cause:
Bad wiring/connection in the pressure switch circuit.
Corrective action:
Check for loose wiring/connections in the pressure switch circuit.
S i p h o n
p u m p o n
Siphon pressure switch detects high pressure in the flue/siphon system.
s w i t c h
9 9 9 , 5 h r s
105