DencoHappel ZGF.1E series Operation Manual page 142

Safety and User Instructions
Fault
Unit fails to heat/heats
insufficiently
(pumped warm water)
Unit not heating/heating
insufficiently (electric
heater)
Unit does not cool/cools
insufficiently (chilled
water)
142
Possible Cause
Very low setpoint temperature selected
on control panel/miniature switch
Control panel/miniature switch or sen-
sor is located above a heat source or
exposed to direct sunshine
Control valve fails to open
Fan not switched on
Air volume flow of unit too low
Air intake or discharge areas blocked
Fan blocked/faulty
Filter is dirty
No mains voltage
Very low setpoint temperature set on
control panel/miniature switch
Control panel/miniature switch or sen-
sor is located above a heat source or
exposed to direct sunshine
Faulty electric heater
Fan not switched on
Air volume flow of unit too low
Air intake or discharge areas blocked
Fan blocked/faulty
Filter is dirty
Cooling medium is not cold
Action/remedy
Increase setpoint temperature on con-
trol panel/miniature switch
Place control panel/miniature switch or
sensor in proper position (technical per-
sonnel only)
Replace faulty control valve (technical
personnel only)
Switch on fan
Select higher speed
Clear or clean air flow paths
Check fan, replace if necessary (tech-
nical personnel only), also see
Page 141„Fan fails to start"
Clean or replace filter
Check fuse/circuit breaker/power sup-
ply
(technical personnel only)
Increase setpoint temperature on con-
trol panel/miniature switch
Place control panel/miniature switch or
sensor in proper position (technical per-
sonnel only)
Replace electric heater (technical per-
sonnel only)
Switch on fan
Select higher fan speed
Clear or clean air flow paths
Check fan, replace if necessary (tech-
nical personnel only), also see
Page 141„Fan fails to start"
Clean or replace filter
Switch on chiller unit
Switch on the circulating pump
Vent the unit
PR-2011-0115-GB • Subject to modifications • R4-12/2015
Flex-Geko Fan Coil Unit