Troubleshooting
ESIE13-02
Part 4 – Troubleshooting
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1.2.13 Domestic Hot Water Capacity Shortage at Low Outdoor Temperatures
Applicable models
EHB*CA, EHV*CA, ERHQ011~016B/CA, ERLQ004~016CA
Error detection
method
Error generating
condition
Supposed causes -
corrective action
(1)
In case the Daikin Altherma LT has no spare capacity compare to the space heating load at low Ta
(see equilibrium temperature [5-01]), the priority shall be given towards space heating (see
anti-recycling timer [8-02] and maximum running timer for domestic hot water [8-01]) and domestic hot
water shall be covered/supported by the electrical heater (To guarantee sufficient domestic hot water
and reasonable domestic hot water heat-up times).
(2)
The applicable Ta can be determined via the Daikin Altherma simulation software
(extranet/software/downloads/altherma/altherma_new_LT).
Possible causes
Corrective action
The settings related to domestic hot water oper-
ation at low Ta - space heating priority [5-02]
and space heating priority temperature [5-03] -
are not set or not optimized according to the site
application
(1)
.
Optimize the settings related to domestic hot
water operation at low Ta - space heating priority
[5-02] and space heating priority temperature
[5-03] - according to the site application:
[5-02] = “1”
[5-03] = “[5-01]
(2)
+ 3~5°C”
