MU1H-1355GE23 R1012
11
Honeywell GmbH
GB
11. Troubleshooting
Problem
Cause
Remedy
SG150 and SG150D
Drips
During the heating up of the water heater no error, normal function
Continually drips from soiling
Actuate lifting grip multiple times so that dirt
particles are flushed out, or replace as neces-
sary
Check valve does not close off
tightly in the front pressure area
Pressure increase in the front pres-sure
area
Replace check valve
Seal surfaces dirty or worn
Replace check valve
Too little or no water pressure
Cut-off fixtures before or after the safety
group not opened entirely
Open the shutoff valves fully
Safety group not installed in the flow
direction
Install safety group in flow direction (observe
arrow direction on housing)
SG150D only
Water is escaping from the spring
bonnet
Diaphragm in valve insert is faulty
Replace valve insert
Too little or no water pressure
Pressure reducing valve is not set to the
desired outlet pressure
Set outlet pressure
Filter in pressure reducing valve is conta-
minated
Clean or replace filter
The outlet pressure set does not
remain constant
Filter in pressure reducing valve is conta-
minated or worn
Clean or replace filter
Valve insert, sealing ring or edge of
nozzle is contaminated or worn
Replace valve insert
Rising pressure on outlet (e.g. in boiler) Check check valve, safety group etc.
Expansion water from the hot water puri-
fier
Inspect ckeck valve before the hot water purifier
and single-lever mixing valve if necessary
Close shut-off valves to the hot water puri-fier
supply line. Open hot water tap connec-tion.
Does pressure remain constant? Expansion
water of the hot water purifier. Does pressure
increase? Pressure reducer defect